Utility Formula Data

$U=E(r)-\frac{1}{2}A{}^2,$ where $A=4$

On the basis of the utility formula above, which investment would you select if you were risk averse with $A=4?$

On the basis of the utility formula above, which investment would you select if you were risk neutral?

The variable $(A)$ in the utility formula represents the:

a$.$ Investor's return requirement.

b$.$ Investor's aversion to risk.

c$.$ Certainty equivalent rate of the portfolio.

$d$ Preference for one unit of return per four units of risk.