Find the Indicated Matrix $\mathrm { A } = \left[ \begin{array} { r r } - 1 & 3 \\ 3 & 4 \end{array} \right]$

Multiple Choice

Find the indicated matrix.
-Let $\mathrm { A } = \left[ \begin{array} { r r } - 1 & 3 \\ 3 & 4 \end{array} \right]$ and $\mathrm { B } = \left[ \begin{array} { l l l } 0 & - 2 & 5 \\ 1 & - 3 & 2 \end{array} \right]$ . Find $\mathrm { AB }$ .

A) $\left[ \begin{array} { r r } 3 & 4 \\ - 7 & - 18 \\ 1 & 23 \end{array} \right]$
B) $\left[ \begin{array} { r r r } 0 & - 6 & 15 \\ 3 & - 12 & 8 \end{array} \right]$
C) $\left[ \begin{array} { r r r } 3 & - 7 & 1 \\ 4 & - 18 & 23 \end{array} \right]$
D) not defined