Which of the Following Utility Functions Exhibits Constant Relative Risk $U ( W ) = W - 0.5 W ^ { 2 }$

Multiple Choice

Which of the following utility functions exhibits constant relative risk aversion?

A) U(W) = W.
B) $U ( W ) = W - 0.5 W ^ { 2 }$
C) U(W) = ln W.
D) U(W) = $- e ^ { - W }$ .