Find the Inverse of the Matrix $\left[ \begin{array} { c c } 8 & 16 \\ - 24 & - 40 \end{array} \right]$

Multiple Choice

Find the inverse of the matrix $\left[ \begin{array} { c c } 8 & 16 \\ - 24 & - 40 \end{array} \right]$ .

A) $\frac { 1 } { 7 } \left[ \begin{array} { c c } 8 & 16 \\ - 24 & - 40 \end{array} \right]$
B) $\frac { 1 } { 8 } \left[ \begin{array} { c c } - 5 & - 2 \\ 3 & 1 \end{array} \right]$
C) $\left[ \begin{array} { c c } - 8 & - 16 \\ 40 & 24 \end{array} \right]$
D) $\left[ \begin{array} { c c } 8 & - 24 \\ 32 & - 56 \end{array} \right]$
E) $\frac { 1 } { 13 } \left[ \begin{array} { c c } - 8 & - 16 \\ - 24 & 40 \end{array} \right]$