Adam is a risk$-$averse investor. Bob is a less risk$-$averse investor than Adam. Therefore,

A$.$ for the same risk, Bob requires a higher rate of return than Adam.

B$.$ for the same return, Adam tolerates higher risk than Bob.

C$.$ for the same return, Bob tolerates higher risk than Adam.

D$.$ for the same risk, Adam requires a lower rate of return than Bob.

E$.$ cannot be determined.