Which of the following statements is most accurate with respect to the measures of the money supply（）
A. When a firm writes a check to an individual, the M1 measure is increased.
B. When an individual pays for a transaction at a business with a credit card, the M2 measure is increased.
C. M2 includes M1 plus time deposits, savings deposits, and money market mutual fund balances.
参考答案：C
解析：
The statement that M2 includes M1 plus time deposits, savings deposits, and money market mutual fund balances is correct. Writing a check does not increase the money supply, it merely transfers funds from one party to another. Likewise, using a credit card does not increase the money supply. Checking balances owned by individuals and firms are included in M1, but those of government are not.