答案：A
該直立角柱體的底面積
該直立角柱體的底面積
$\begin{array}{cl}
= & 9 \times 7 – 5 \times 5 \\
= & 38 \text{ cm}^2
\end{array}$
由此，其體積
$\begin{array}{cl}
= & 38 \times 12 \\
= & 456\text{ cm}^3
\end{array}$
