Ans: A
$P\text{(the sum is a multiple of $4$)}$
$P\text{(the sum is a multiple of $4$)}$
$\begin{array}{cl}
= & P\text{($3$ and $5$)} + P\text{($5$ and $7$)} \\
= & \dfrac{C^2_2}{C^4_2} + \dfrac{C^2_2}{C^4_2} \\
= & \dfrac{1}{3}
\end{array}$
