单选题 Which of the following is not a characteristic of a portfolio located on the efficient frontier?

A、 the portfolio offers the highest possible return for its level of standard deviation.
B、 the portfolio offers the highest possible risk for its level of return.
C、 the portfolio offers the lowest possible risk for its level of return.

【正确答案】 B

【答案解析】If a portfolio offers the highest possible return for a given standard deviation, it also offers the maximum return for that level of standard deviation squared.