Find the Indicated Sum or Difference, If It Is Defined

Multiple Choice

Find the indicated sum or difference, if it is defined.
- $$\left[ \begin{array} { r } 5 x + 5 y \\- 6 k - 9 z \\2 w + 6 v \\- 2 m - 9 n\end{array} \right] - \left[ \begin{array} { c } 2 x + 2 y \\2 k - 4 z \\4 w + 9 v \\6 m - 3 n\end{array} \right]$$

A)
$\left[ \begin{array} { r } 3 x + 7 y \\ - 8 k - 13 z \\ - 2 w + 15 v \\ - 8 m - 12 n \end{array} \right]$
B) $\left[ \begin{array} { r } 3 x + 3 y \\ - 8 k + 5 z \\ - 2 w - 3 v \\ - 8 m + 6 n \end{array} \right]$
C) $\left[ \begin{array} { r } 3 x - 7 y \\ - 8 k - 13 z \\ - 2 w - 15 v \\ - 8 m - 12 n \end{array} \right]$
D) $\left[ \begin{array} { r } 3 x + 3 y \\ - 8 k - 5 z \\ - 2 w - 3 v \\ - 8 m - 6 n \end{array} \right]$