I need to determine the correct answer for this multiple choice question in Thai about financial markets. Let me translate and analyze each option:

Question: "Which of the following choices is most correct regarding types of financial markets?"

Option A: "Instruments traded in the money market are short-term financial instruments that are already circulating in the money market" Option B: "The primary securities market can be classified by maturity into money market and capital market" Option C: "The capital market is a central place for trading equities, debt instruments, and derivatives with maturities greater than 1 year" Option D: "In practice, the debt securities market is a central place for trading only long-term debt securities of the government and private sectors"

Now let me evaluate each option:

Option A states that instruments in the money market are short-term financial instruments that are already circulating in the money market. This is somewhat circular in definition and doesn't provide much insight.

Option B states that the primary securities market can be classified by maturity into money market and capital market. This is generally correct - financial markets are typically divided into money markets (short-term, typically less than 1 year) and capital markets (longer-term).

Option C states that the capital market is a central place for trading equities, debt instruments, and derivatives with maturities greater than 1 year. This is correct - capital markets deal with longer-term instruments (typically > 1 year).

Option D states that the debt securities market is only for trading long-term debt securities of the government and private sectors. This is incorrect because debt securities markets include both short-term and long-term instruments.

Between the options, B and C appear most accurate. Option B describes a fundamental classification of financial markets, while Option C correctly describes the capital market. Both contain correct information, but I need to determine which is more precise or comprehensive for this specific question.

Option B focuses on the classification principle (by maturity), which is a fundamental way to distinguish between money markets and capital markets.

Option C provides more specific details about what is traded in capital markets, mentioning equities, debt instruments, and derivatives with maturities greater than 1 year.

Given that the question asks about the types of financial markets, I believe option B is more directly addressing the classification of financial markets, while option C is focusing more specifically on what is traded in capital markets.

I believe option B is the correct answer: "ตลาดตราสารพื้นฐานสามารถจําแนกตามอายุครบไถ่ถอนออกเป็นตลาดเงิน และตลาดทุน" (The primary securities market can be classified by maturity into money market and capital market).

Okay, let's tackle this question. The user is asking about the correct statement regarding types of financial markets. The options are in Thai, so I need to parse them carefully.

First, let's understand each option:

Option a: "ตราสารที่ซื้อขายในตลาดเงิน เป็นตราสารการเงินระยะสั้นที่หมุนเวียนในตลาดเงินอยู่แล้ว" translates to "Instruments traded in the money market are short-term financial instruments already circulating in the money market." This seems a bit circular. It's saying that money market instruments are short-term and already in the money market. Maybe true, but not sure if it's the best answer.

Option b: "ตลาดตราสารพื้นฐานสามารถจำแนกตามอายุครบไถ่ถอนออกเป็นตลาดเงิน และตลาดทุน" which means "Primary markets can be classified by maturity into money markets and capital markets." Wait, primary markets are where new securities are issued, while secondary markets are where existing ones are traded. But the classification into money and capital markets is usually based on maturity (short-term vs. long-term), not the type of market (primary vs secondary). So maybe this is mixing concepts. The primary market isn't split into money and capital; instead, money and capital markets can have both primary and secondary markets. So this might be incorrect.

Option c: "ตลาดทุนเป็นแหล่งกลางสำหรับซื้อขายทั้งตราสารทุน ตราสารหนี้ และตราสารอนุพันธ์ที่มีอายุมากกว่า 1 ปี" translates to "The capital market is a central place for trading equity, debt, and derivative instruments with a maturity of more than 1 year." Capital markets do deal with long-term securities. Equities are perpetual, debt here would be long-term (like bonds over 1 year), and derivatives can vary, but generally, capital markets include these. This seems correct.

Option d: "ในทางปฏิบัติ ตลาดตราสารหนี้เป็นแหล่งกลางซื้อขายตราสารหนี้ระยะยาวของภาครัฐ และภาคเอกชนเท่านั้น" meaning "In practice, the debt market is a central place for trading long-term debt instruments of the government and private sector only." But debt markets include both short-term (money market) and long-term (capital market). So if this is saying only long-term, that's incorrect because money markets have short-term debt like T-bills. So this statement is wrong.

So the correct answer should be option c. It correctly states that capital markets handle equity, debt, and derivatives with maturities over a year. The other options have inaccuracies either in definitions or classifications.

Alright, let's tackle this question step by step. The question is about identifying the correct statement regarding types of financial markets. There are four options: a, b, c, and d.

First, I'll read each option carefully to understand what they're stating.

Option a says: "ตราสารที่ซื้อขายในตลาดเงินเป็นตราสารการเงินระยะสั้นที่หมุนเวียนในตลาดเงินอยู่แล้ว." Translating this, it means that instruments traded in the money market are short-term financial instruments that already circulate in the money market. This seems accurate because the money market typically deals with short-term, highly liquid instruments like commercial papers and treasury bills.

Option b states: "ตลาดตราสารพื้นฐานสามารถจำแนกตามอายุครบไถ่ถอนออกเป็นตลาดเงิน และตลาดทุน." This translates to: The basic securities market can be classified based on maturity into money market and capital market. This is a standard classification in finance. The money market deals with short-term securities, while the capital market handles long-term securities and instruments. So, this statement seems correct.

Option c claims: "ตลาดทุนเป็นแหล่งกลางสำหรับซื้อขายทั้งตราสารทุน ตราสารหนี้ และตราสารอนุพันธ์ที่มีอายุมากกว่า 1 ปี." This means the capital market is a central place for trading both equity, debt instruments, and derivatives with maturities over one year. This is mostly correct, as the capital market does involve long-term instruments, including equities and long-term bonds. However, derivatives can have varying maturities, not necessarily all over one year, so this might be a point to consider.

Option d says: "ในทางปฏิบัติ ตลาดตราสารหนี้เป็นแหล่งกลางซื้อขายตราสารหนี้ระยะยาวของภาครัฐ และภาคเอกชนเท่านั้น." This translates to: In practice, the bond market is a central place for trading long-term debt instruments of the government and private sectors only. This statement is too restrictive. The bond market includes a broader range of participants and instruments beyond just government and private sectors, so this might not be entirely accurate.

Now, comparing the options:

• Option a is correct about the money market dealing with short-term instruments.
• Option b correctly classifies the securities market into money and capital markets based on maturity.
• Option c is mostly correct but might be slightly off regarding derivatives.
• Option d is incorrect because it limits the bond market too much.

Between a and b, both seem correct, but the question asks for the "most correct" statement. Option b provides a broader classification that is fundamental in financial markets, making it the most accurate choice.

Okay, so I've got this multiple-choice question about financial markets, and I need to figure out the correct answer. Let's break it down step by step.

First, the question is asking which option correctly describes the types of financial markets. The options are labeled a, b, c, and d. I need to understand each option thoroughly to determine which one is correct.

Starting with option a: "ตราสารที่ซื้อขายในตลาดเงิน เป็นตราสารการเงินระยะสั้นที่หมุนเวียนในตลาดเงินอยู่แล้ว." Translating this, it says, "The financial instruments traded in the money market are short-term financial instruments that circulate in the money market anyway." Hmm, this seems a bit circular. It's stating that short-term instruments are traded in the money market, which is true, but it doesn't provide a comprehensive explanation of the types of financial markets. So, while it's correct, it might not be the best answer.

Moving on to option b: "ตลาดตราสารพื้นฐานสามารถจำแนกตามอายุครบไถ่ถอนออกเป็นตลาดเงิน และตลาดทุน." Translating, it says, "The primary market can be classified according to the maturity redemption period into the money market and the capital market." Wait, that doesn't sound quite right. The primary market is where new securities are issued, and it's separate from the secondary market where existing securities are traded. The classification into money and capital markets is more about the type of instruments rather than the primary market itself. So, this might not be the correct answer.

Option c: "ตลาดทุนเป็นแหล่งกลางสำหรับซื้อขายทั้งตราสารทุน ตราสารหนี้ และตราสารอนุพันธ์ที่มีอายุมากกว่า 1 ปี." Translating, it says, "The capital market is a central market for trading in equity securities, debt securities, and derivatives with a maturity of more than one year." This seems accurate. The capital market does deal with long-term instruments, including stocks, bonds, and derivatives. This option provides a clear and comprehensive description of the capital market.

Lastly, option d: "ในทางปฏิบัติ ตลาดตราสารหนี้เป็นแหล่งกลางซื้อขายตราสารหนี้ระยะยาวของภาครัฐ และภาคเอกชนเท่านั้น." Translating, it says, "In practice, the debt market is a central market for trading long-term debt instruments of the public and private sectors only." This is partially correct. The debt market does involve long-term debt instruments, but it's not limited to just the public and private sectors. There are other entities and types of debt instruments involved. So, this option is too restrictive and not entirely accurate.

Based on this analysis, option c provides the most accurate and comprehensive description of the types of financial markets, specifically focusing on the capital market and the instruments it deals with. It correctly identifies the capital market as handling long-term instruments, which aligns with standard financial market classifications.

I should also consider if there's any overlap or if any other option could be correct. Option a is correct in its statement but doesn't fully address the question about the types of markets. Option b incorrectly associates the classification with the primary market, which isn't accurate. Option d is too narrow in its scope. Therefore, option c stands out as the best answer.

Okay, let's tackle this question. The user provided a multiple-choice question in Thai about financial markets. I need to figure out the correct answer. First, I'll translate the question and options to understand them better.

The question is asking: "Which of the following is the most correct about the types of financial markets?"

The options are:

a) "Money market instruments are short-term financial instruments that circulate in the money market." b) "The basic securities market can be classified according to the maturity period into the money market and the capital market." c) "The capital market is a central market for buying and selling both equity and debt securities, and derivatives with a maturity of more than 1 year." d) "In practice, the debt securities market is a central market for trading long-term government and private debt securities only."

Now, I need to recall the different types of financial markets. Let's break down each option.

Starting with option a: Money market instruments are indeed short-term, typically with maturities under a year. The statement says they "circulate in the money market," which is correct. But I need to check if this is the best answer compared to others.

Option b: The basic securities market (maybe referring to primary or secondary?) being split by maturity into money and capital markets. Wait, actually, the standard classification is that the money market deals with short-term instruments (under 1 year), and the capital market with longer-term (over 1 year). So the capital market includes both debt and equity, while the money market is for short-term debt. So if the question is about classifying markets by maturity, then the capital and money markets are indeed divided by maturity. So option b might be correct.

Option c: The capital market includes derivatives with over 1 year? Wait, derivatives can have various maturities. Also, the capital market primarily deals with equity and long-term debt. Derivatives might be part of a separate market, like the derivatives market. So this might be incorrect.

Option d: Debt securities market only includes government and private long-term debt. But the debt market can include corporate, government, and maybe others. Also, "only" might be too restrictive. Plus, the debt market isn't limited to just long-term if it's the capital market. Wait, the debt market could be split into money (short-term) and capital (long-term). So maybe the debt securities market here refers to the capital part, but the option says "debt securities market" as only government and private. Not sure yet.

Looking back at option b: The basic securities market (maybe "primary" market?) being split into money and capital by maturity. Wait, actually, the primary market is where new securities are issued, while secondary is trading. The question mentions "ตลาดตราสารพื้นฐาน" which translates to "basic securities market" but might be a mistranslation. Alternatively, perhaps "basic" here refers to primary. But the standard classification is that financial markets are divided into money and capital based on maturity. So the capital market includes the stock and long-term debt markets, while money is short-term. So option b's statement that the basic securities market is divided by maturity into money and capital might be mixing concepts. Wait, actually, the division into money and capital markets is based on the maturity of the instruments, so the statement in option b is correct. The money market and capital market are parts of the debt market categorized by maturity. So option b is correct?

Wait, but let me check again. The capital market includes both equity (stocks) and long-term debt. The money market is only for short-term debt. So the classification by maturity applies to debt instruments, but the capital market also includes equity. Therefore, option b's statement might be incorrect because it's not just about debt. Hmm, maybe that's a problem. The question says "ตลาดตราสารพื้นฐาน" which could mean "basic securities market" but perhaps it's a mistranslation of "capital market"? Alternatively, maybe the question is referring to the division of the debt market into money and capital based on maturity. If that's the case, then option b is correct. Alternatively, maybe the correct answer is a?

Option a says money market instruments are short-term that circulate in the money market. That's a bit redundant but technically correct. However, the question is about the "most correct" statement. Let me think again.

Option b's statement: If the basic securities market (maybe primary market) is divided by maturity into money and capital, that might not be accurate. The primary market is where securities are first sold, while the division into money and capital is about the type of instruments and their maturities. So perhaps option b is incorrect.

Option c says the capital market includes derivatives with over 1 year. But derivatives can have any maturity, and they are usually part of a separate derivatives market. So that's incorrect.

Option d says the debt securities market is only for government and private long-term. But the debt market includes both short-term (money market) and long-term (capital market). The debt securities market as a whole includes both, but if the question refers to the capital market's debt part, then maybe. But the option says "debt securities market" as only government and private. Not sure. Also, "only" might be wrong because there could be other issuers.

So going back, the most accurate is option b? Or a?

Wait, the standard classification is that the money market deals with short-term (under 1 year) instruments, and the capital market with long-term (over 1 year). So the division is based on maturity. Therefore, the statement in option b is correct because it says the basic securities market (maybe referring to the debt market?) is divided by maturity into money and capital. But if "basic securities market" is supposed to mean the entire market, then maybe not. Alternatively, perhaps the question's option b is correct because it's the standard way to classify money vs capital markets by maturity. So I think the correct answer is b.

Alright! Let's tackle this question step by step. The user provided a multiple-choice question in Thai about financial markets and asked for the correct answer key in JSON format.

First, I need to understand each option thoroughly. The question is asking which statement is the most accurate regarding the types of financial markets.

Option A says that instruments traded in the money market are short-term financial instruments that already circulate in the money market. That makes sense because the money market typically deals with short-term debt instruments, like commercial papers and treasury bills, which have maturities under one year. So, A seems correct.

Option B mentions that the basic instrument market can be classified by maturity into the money market and the capital market. This is a standard classification in finance. The money market handles short-term instruments, while the capital market deals with long-term instruments. So, B also appears to be correct.

Option C states that the capital market is a channel for trading all types of equity instruments, debt instruments, and derivatives with maturities over one year. This is partially correct because the capital market does involve long-term instruments, but it doesn't typically include derivatives with maturities over a year as a primary focus. Derivatives can have various maturities and are often traded in different markets. So, C might not be entirely accurate.

Option D claims that in practice, the debt market is only a channel for trading long-term government and private debt instruments. This isn't accurate because the debt market includes both short-term and long-term instruments. The money market, as part of the debt market, deals with short-term debt, so D is incorrect.

Now, comparing A and B, both seem correct. However, the question asks for the most accurate statement. Option B provides a broader classification of the basic instrument market into money and capital markets based on maturity, which is a fundamental concept in financial markets. Therefore, B is the most accurate answer.

Let me analyze this Thai language question about money market instruments.

The question asks: "Which of the following is most correct about money market instruments"

Option A: "Bonds with a remaining maturity of not more than 1 year are considered money market instruments." Option B: "The trading prices of money market instruments in the secondary market are highly volatile." Option C: "Considered financial instruments that have no liquidity because they have short redemption periods." Option D: "There is a high risk from changes in interest rates in the financial market."

Let me assess each option:

A) This statement is correct. Money market instruments are typically short-term debt instruments with maturities of up to one year. Bonds with a remaining maturity of less than 1 year are considered money market instruments.

B) This statement is incorrect. Money market instruments typically have low price volatility in the secondary market precisely because they have short maturities. The closer to maturity, the less price volatility an instrument experiences from interest rate changes.

C) This statement is incorrect. Money market instruments are highly liquid, not illiquid. Their short maturities actually contribute to their liquidity, as investors know they'll get their principal back soon.

D) This statement is incorrect. Money market instruments have LOW interest rate risk, not high risk, precisely because of their short maturities. The shorter the maturity, the less sensitive the price is to interest rate changes.

Based on my analysis, option A is the most correct statement about money market instruments.

Therefore, the correct answer key is "a".

Okay, let's tackle this question. The user is asking which of the options is the most correct regarding money market instruments. The options are in Thai, so I need to translate them properly to understand each choice.

First, I need to recall what money market instruments are. From what I remember, money market instruments are short-term debt securities with maturities of one year or less. They are considered low-risk and highly liquid. Examples include Treasury bills, commercial paper, and certificates of deposit.

Now, looking at the options:

Option a: "พันธบัตรที่มีอายุคงเหลือไม่เกิน 1 ปี ถือเป็นตราสารตลาดเงิน" translates to "Bonds with a remaining maturity of not more than 1 year are considered money market instruments." Wait, bonds typically have longer maturities. If a bond has less than a year remaining, does that make it a money market instrument? I think money market instruments are issued with short maturities from the start, not just bonds that are near maturity. So maybe this is incorrect.

Option b: "ราคาซื้อขายตราสารตลาดเงินในตลาดรองมีความผันผวนมาก" means "The trading prices of money market instruments in the secondary market are highly volatile." But money market instruments are supposed to be low-risk and stable, so their prices shouldn't fluctuate much. High volatility is more associated with stocks or long-term bonds. So this might be incorrect.

Option c: "ถือเป็นตราสารการเงินที่ไม่มีสภาพคล่อง เพราะมีอายุไถ่ถอนสั้น" translates to "They are considered illiquid financial instruments because they have a short maturity period." That doesn't make sense. Short-term instruments are usually more liquid because they can be quickly converted to cash. So this is probably wrong.

Option d: "มีความเสี่ยงที่เกิดจากการเปลี่ยนแปลงของอัตราดอกเบี้ยในตลาดการเงินสูง" means "They have high risk due to changes in market interest rates." But money market instruments are short-term, so they are less affected by interest rate changes compared to long-term bonds. The interest rate risk is lower here. So this might be incorrect.

Putting it all together: The correct answer should be option a, but wait, bonds (พันธบัตร) are usually long-term. Money market instruments are things like Treasury bills (which are short-term), commercial paper, etc. So if a bond has less than a year remaining, does it become a money market instrument? Or is the definition based on original maturity? I think original maturity matters. So if a bond was issued with, say, 10 years, and now has 1 year left, it's still a bond, not a money market instrument. Therefore, option a might be incorrect. Wait, maybe the question is in Thai, and in Thai financial terms, maybe they consider bonds with remaining maturity under 1 year as money market instruments. But generally, money market instruments are issued with short maturities. So perhaps option a is correct. Alternatively, maybe the correct answer is a. But I need to verify.

Alternatively, maybe option d is correct. If interest rates change, the value of fixed-income securities changes. But for short-term instruments, the impact is less. So high interest rate risk would be incorrect. So d is wrong. Option b: high price fluctuation in secondary market. Since money market instruments are short-term, their prices are close to par and don't fluctuate much. So b is incorrect. Option c: illiquid because short maturity. No, short-term usually means more liquid. So c is wrong. So the only possible correct answer is a. Even though bonds are typically long-term, if they have remaining maturity under 1 year, maybe in this context they are considered money market instruments. So the answer is a.

Alright, let's tackle this question step by step. The question is about identifying the correct statement regarding money market instruments. The options are in Thai, so I'll need to translate and understand each one carefully.

First, let's recall what money market instruments are. They are short-term debt instruments with maturities typically less than a year. Examples include commercial paper, treasury bills, and certificates of deposit. These instruments are considered low-risk and are used for managing liquidity.

Now, let's look at each option:

Option A: "พันธบัตรทีมีอายุคงเหลือไม่เกิน 1 ปี ถือเป็นตราสารตลาดเงิน"
Translation: "Bonds with a remaining maturity of no more than 1 year are considered money market instruments."

• This makes sense because money market instruments are defined by their short maturity, typically less than a year. So, bonds maturing in a year or less would fall into this category.

Option B: "ราคาซื้อขายตราสารตลาดเงินในตลาดรองมีความผันผวนมาก"
Translation: "The buying and selling prices of money market instruments in the secondary market are highly volatile."

• Money market instruments are generally known for their stability and low volatility. They are considered safe-haven assets, so high volatility here seems unlikely.

Option C: "ถือเป็นตราสารการเงินทีไม่มีสภาพคล่อง เพราะมีอายุไถ่ถอนสั้น"
Translation: "They are considered financial instruments without liquidity because they have a short maturity."

• This is incorrect. Short maturity actually increases liquidity because the instruments can be easily converted to cash within a short period.

Option D: "มีความเสี่ยงทีเกิดจากการเปลียนแปลงของอัตราดอกเบี้ยในตลาดการเงินสูง"
Translation: "They have a high level of risk arising from changes in interest rates in the financial market."

• While it's true that interest rate changes can affect the value of fixed-income securities, money market instruments are less sensitive to this because of their short maturities. The risk is relatively low compared to long-term bonds.

After analyzing each option, Option A aligns with the definition of money market instruments as short-term debt securities. The other options either contradict the characteristics of money market instruments or misrepresent their typical behavior in the financial markets.

Okay, so I've got this multiple-choice question about financial instruments in the money market. Let me try to break it down and figure out the right answer.

First, the question is asking which of the options is the most correct regarding money market instruments. The options are labeled a, b, c, and d. I need to understand each option and determine which one is accurate.

Starting with option a: "พันธบัตรทีมีอายุคงเหลือไม่เกิน 1 ปี ถือเป็นตราสารตลาดเงิน." Translating that, it says, "Bonds with a remaining maturity of no more than 1 year are considered money market instruments." Hmm, I remember that money market instruments are short-term financial instruments with maturities typically less than one year. So this seems plausible. But I need to check the other options to see if there's a better answer.

Option b: "ราคาซื้อขายตราสารตลาดเงินในตลาดรองมีความผันผวนมาก." Translating, it means, "The buying and selling prices of money market instruments in the secondary market are highly volatile." I'm not too sure about this one. I think money market instruments are generally considered to be low-risk and have stable prices because they're short-term. So maybe this isn't the best answer.

Option c: "ถือเป็นตราสารการเงินทีไม่มีสภาพคล่อง เพราะมีอายุไถ่ถอนสั้น." This translates to, "They are considered financial instruments with no liquidity because they have a short redemption period." Wait, that doesn't sound right. Short redemption periods usually mean high liquidity because they can be easily bought and sold. So this option seems incorrect.

Option d: "มีความเสี่ยงทีเกิดจากการเปลียนแปลงของอัตราดอกเบี้ยในตลาดการเงินสูง." Translating, it says, "They have high risk due to changes in interest rates in the financial market." I know that money market instruments are sensitive to interest rate changes, but since they're short-term, the risk might be lower compared to long-term instruments. So I'm not sure if this is the best answer.

Going back to option a, it seems straightforward. Money market instruments are indeed short-term, typically with maturities of one year or less. So option a seems correct. But let me double-check the other options to make sure I'm not missing something.

Option b talks about volatility in the secondary market. While some money market instruments might have slight fluctuations, they're generally stable. So I don't think this is the best answer.

Option c is definitely incorrect because short maturity doesn't mean low liquidity; in fact, it usually means high liquidity.

Option d mentions high risk from interest rate changes. While there is some risk, it's usually lower compared to longer-term instruments. So I don't think this is the best answer either.

Therefore, the most accurate answer seems to be option a: "พันธบัตรทีมีอายุคงเหลือไม่เกิน 1 ปี ถือเป็นตราสารตลาดเงิน."

Okay, let's tackle this question. The user is asking about the correct statement regarding money market instruments. The options are a, b, c, d.

First, I need to recall what money market instruments are. Money market instruments are short-term debt securities that are liquid and have high credit quality. They typically have maturities of one year or less.

Looking at option a: "พันธบัตรที่มีอายุคงเหลือไม่เกิน 1 ปี ถือเป็นตราสารตลาดเงิน" which translates to "Bonds with remaining maturity of no more than 1 year are considered money market instruments." That sounds correct because money market instruments are indeed short-term, usually a year or less. So a might be a candidate.

Option b: "ราคาซื้อขายตราสารตลาดเงินในตลาดรองมีความผันผวนมาก" meaning "The trading price of money market instruments in the secondary market is highly volatile." Hmm, money market instruments are usually considered low risk and less volatile because they're short-term. So maybe b is incorrect because their prices don't fluctuate as much as, say, stocks or long-term bonds.

Option c: "ถือเป็นตราสารการเงินที่ไม่มีสภาพคล่อง เพราะมีอายุไถ่ถอนสั้น" translates to "Are considered illiquid financial instruments because they have short redemption periods." That doesn't make sense. Short-term instruments are typically more liquid, not less. So c is probably wrong.

Option d: "มีความเสี่ยงที่เกิดจากการเปลี่ยนแปลงของอัตราดอกเบี้ยในตลาดการเงินสูง" meaning "Have high risk from changes in market interest rates." Since money market instruments are short-term, their interest rate risk is lower compared to long-term bonds. So d is likely incorrect.

So the correct answer should be a. Let me double-check. Yes, money market instruments are indeed short-term (under a year), so a is correct. The other options either contradict the characteristics of money market instruments or are incorrect.

Alright! Let's tackle this question step by step. The user provided a multiple-choice question in Thai about money market instruments. The options are labeled a, b, c, and d. I need to figure out which one is the most correct.

First, I should understand what each option is saying. Option a states that bonds with a remaining maturity of no more than one year are considered money market instruments. That makes sense because money market instruments typically have short maturities, often under a year. This seems accurate.

Option b claims that the buying and selling prices of money market instruments in the secondary market are highly volatile. I'm not sure about this. Money market instruments are generally considered low-risk and stable, so high volatility doesn't sound right.

Option c says these instruments are illiquid because they have short maturities. Wait, actually, short-term instruments are usually very liquid because they can be easily converted to cash. So, this statement might be incorrect.

Option d mentions that they have a high risk due to changes in interest rates. While it's true that interest rate changes affect fixed-income instruments, money market instruments have short durations, so their sensitivity to rate changes is lower compared to long-term bonds. Therefore, the risk might not be as high as implied here.

Putting it all together, option a seems to be the most accurate description of money market instruments. The other options either contradict what I know or aren't the best fit.