Find the Indicated Matrix $A = \left[ \begin{array} { r r } - 1 & 3 \\ 2 & 2 \end{array} \right]$

Multiple Choice

Find the indicated matrix.
-Let $A = \left[ \begin{array} { r r } - 1 & 3 \\ 2 & 2 \end{array} \right]$ and $B = \left[ \begin{array} { c c } - 2 & 0 \\ - 1 & 1 \end{array} \right]$ . Find $A B$ .

A) $\left[ \begin{array} { l l } - 1 & 3 \\ - 6 & 2 \end{array} \right]$
B) $\left[ \begin{array} { l l } 3 & - 1 \\ 2 & - 6 \end{array} \right]$
C) $\left[ \begin{array} { r r } 2 & 0 \\ - 2 & 2 \end{array} \right]$
D) $\left[ \begin{array} { r r } 2 & - 6 \\ - 1 & - 1 \end{array} \right]$