如果

1

2

a^3xb^y与﹣a^2yb^x+1是同类项，则（     ）

A：$\{\begin{array}{l}x=-2\\ y=3\end{array}$

B：$\{\begin{array}{l}x=2\\ y=-3\end{array}$

C：$\{\begin{array}{l}x=-2\\ y=-3\end{array}$

D：$\{\begin{array}{l}x=2\\ y=3\end{array}$