# If $A=\begin{bmatrix}0&2\\3&-4\end{bmatrix}$ and $kA=\begin{bmatrix}0&3a\\2b&24\end{bmatrix}$ then the values of $k,a,b$ are respectively
$\begin{array}{1 1}(A)\;-6,-12,-18&(B)\;-6,4,9\\(C)\;-6,-4,-9&(D)\;-6,12,18\end{array}$