Based on the security market line, company C-A stock has a required return of 7% and company C-B has a required return of 5%. C-A has a standard deviation of returns of 9%. Therefore:

A) C-B must have a standard deviation of returns of less than 9% because C-B is less risky than C-A.

B) The beta for C-B must be greater than the beta for C-A because C-B is the better buy for a risk-averse investor.

C) All rational investors will prefer C-B over C-A.

D) For a well-diversified investor, C-B is less risky than C-A.