Which of the Following Portfolios Cannot Be on the Efficient

Multiple Choice

Which of the following portfolios cannot be on the efficient frontier?

A) A: expected return of 10 percent; standard deviation of 8 percent
B) B: expected return of 18 percent; standard deviation of 13 percent
C) C: expected return of 38 percent; standard deviation of 38 percent
D) D: expected return of 15 percent; standard deviation of 14 percent