In a Particular Year, Roll Tide Mutual Fund Earned a Return

In a particular year, Roll Tide Mutual Fund earned a return of 15% by making the following investments in the following asset classes: $\begin{array}{cc}& \text { Weight } & \text { Return }\\ \text { Bonds } &10\%&6\%\\ \text { Stocks } &90\%&16\%\\\end{array}$


The return on a bogey portfolio was 10%, calculated as follows:
$\begin{array}{cc}& \text { Weight } & \text { Return }\\ \text { Bonds (Lehman Brother Index) } &50\%&5\%\\ \text { Stacks (S\&P 500 Index) } &50\%&15\%\\\end{array}$

The total abnormal return on the Roll Tide managed portfolio was

A) 1%.
B) 3%.
C) 4%.
D) 5%.