若2a^3xb^y+5与5a^2-4yb^2x是同类项，则（      ）

A：$\left\{\begin{array}{c}x=1\\ y=2\end{array}\right.$

B：$\left\{\begin{array}{c}x=2\\ y=-1\end{array}\right.$

C：$\left\{\begin{array}{c}x=0\\ y=2\end{array}\right.$

D：$\left\{\begin{array}{c}x=3\\ y=1\end{array}\right.$