答案和详解如下：

24、Correct answer is A

"Statistical Concepts and Market Returns," Richard A. Defusco, Dennis W. McLeavey, Jerald E. Pinto, and David E. Runkel

2008 Modular Level I, Vol. 1, pp. 291-297

Study Session 2-7-h

define, calculate, and interpret the coefficient of variation and the Sharpe ratio

The coefficient of variation is defined as the standard deviation of the portfolio (a measure of risk) divided by the mean return on the portfolio (i.e., risk per unit of mean return).

24、For an investment portfolio, the coefficient of variation of the returns on the portfolio is best described as measuring:

A. risk per unit of mean return.

B. mean return per unit of risk.

C. risk per unit of mean excess return.

D. mean excess return per unit of risk.