Refer to the Following:
the Following Table Shows the Expected

Refer to the following:
The following table shows the expected value and variance for 5 projects a firm can undertake.
$$\begin{array} { c c c } \text { Praiecl } & \text { Expeted Value } & \text { Variance } \\\hline A & \$ 100 & \$ 124 \\B & \$ 220 & \$ 110 \\C & \$ 100 & \$ 138 \\D & \$ 180 & \$ 138 \\E & \$ 200 & \$ 124\end{array}$$
-Which of the following is (are) correct if the mean-variance rule is used for the decision?

A) Project C is preferable to A.
B) Project E is preferable to B.
C) Project D is preferable to C.
D) all of the above
E) none of the above