a) Estimate monthly expected returns and the associated risk (standard deviation) for each of the company A,B C securities b) Rank securities of company A, B, and C from the most preferred to the least preferred, assuming that the rational investor behavior holds. Year Return of Company C 1 2 Return of Company A 8.20% -4.71% 0.15% 1.68% Return of Company B 4.08% -2.73% 0.12% 2.60% 2.07% -4.44% 0.54% -12.78% 3 4