Final answer:
Corporate bonds (C) are not money market instruments because they are long-term debt securities with maturities longer than a year, whereas money market instruments have very short maturities and are considered to have high liquidity.
Step-by-step explanation:
The instrument that is NOT a money market instrument is C. corporate bonds. Money market instruments are short-term financial instruments that typically have high liquidity and very short maturities. Examples include treasury bills (T-bills), commercial paper, and bankers' acceptances. Treasury bills are short-term securities with maturities of 13, 26, or 52 weeks, while corporate bonds are generally long-term debt securities with maturities longer than one year, often stretching up to 30 years, and are used by companies to raise capital for various purposes.
Corporate bonds differ from money market instruments because they usually have higher interest rates to compensate for the longer-term investment and higher risks associated with corporate borrowing, as opposed to the safer, government-backed securities found in the money market.