Under Expected Utility Theory, Which of the Following Implies Risk $E u(x)<u(E(x))$

Multiple Choice

Under expected utility theory, which of the following implies risk aversion?

A) $E u(x) <u(E(x) )$ .
B) $x_{c e}>E(x)$
C) $u^{\prime \prime}(x) >0$
D) The utility function is convex.