Using the Table Below, Which Plan Has the Greatest Efficiency

Using the table below, which plan has the greatest efficiency? $\begin{array}{rccc}&\text { Expected Return}& \text { Expected Return}&\text { Expected Return}\\&\text { With Sample }& \text { With Perfect }& \text { Using Expected }\\&\text { Information }& \text {Information }& \text {Value (EREV) }\\\text { I } & 15 & 20 & 10 \\\text { II } & 15 & 20 & 12 \\\text { III } & 18 & 25 & 10 \\\text {IV } & 16 & 20 & 10\end{array}$

A) I
B) II
C) III
D) IV