Investment A has an expected return of 14% with a standard deviation of 4%, while investment B has ...

Investment A has an expected return of 14% with a standard deviation of 4%, while investment B has an expected return of 20% with a standard deviation of 9%. Therefore,
A) a risk averse investor will definitely select investment A because the standard deviation is lower.
B) a rational investor will pick investment B because the return adjusted for risk (20% - 9%) is higher than the return adjusted for risk for investment A ($14% - 4%).
C) it is irrational for a risk-averse investor to select investment B because its standard deviation is more than twice as big as investment A's, but the return is not twice as big.
D) rational investors could pick either A or B, depending on their level of risk aversion.