Ans: D
The following table is the sample space.
$\begin{array}{|c|c|c|c|c|c|} \hline
& 1 & 2 & 3 & 4 & 5 \\ \hline
6 & 6 & 12 & 18 & 24 & 30 \\ \hline
7 & 7 & 14 & 21 & 28 & 35 \\ \hline
8 & 8 & 16 & 24 & 32 & 40 \\ \hline
9 & 9 & 18 & 27 & 36 & 45 \\ \hline
\end{array}$
The required probability
$\begin{array}{cl}
= & \dfrac{9}{20}
\end{array}$
