Add and Subtract Matrices
-Let $A = \left[ \begin{array} { r } 3 \\ - 5 \\ - 4 \end{array} \right]$

Add and Subtract Matrices
-Let $A = \left[ \begin{array} { r } 3 \\ - 5 \\ - 4 \end{array} \right]$ and $B = \left[ \begin{array} { r } - 5 \\ 3 \\ 9 \end{array} \right]$ . Find $A + B$ .

A)
$\left[ \begin{array} { r } - 2 \\ - 2 \\ 5 \end{array} \right]$
B)
$\left[ \begin{array} { l l l } - 2 & - 2 & 5 \end{array} \right]$
C)
$\left[ \begin{array} { r r } 3 & - 5 \\ - 5 & 3 \\ - 4 & 9 \end{array} \right]$
D)
$\left[ \begin{array} { l } 2 \\ 5 \\ 6 \end{array} \right]$