Five assets have expected mean returns and standard deviations as follows: (1) 8% 15%; (2) 12% 18%; (3) 11% 18%; (4) 15% 20%; (5) 11% 17%. Which of these assets will be rejected by all rational risk-averse investors?

A. (4) and (5)

B. (2) and (4)

C. only (3)

D. only (5) E. (2) and (3)

Please provide explanation/formula, thank you so much