Matrices Practice Test

Which of the following matrices is equal to $3 \begin{bmatrix} 2 & -1 \\ 4 & 0 \end{bmatrix}$?

Matrices $A$ and $B$ represent two coded messages combined by addition. What is $A+B$ if $$A=\begin{bmatrix}-1 & 3\\ 4 & -2\end{bmatrix},\quad B=\begin{bmatrix}5 & -3\\ -2 & 1\end{bmatrix}?$$