一种饮料有两种包装，5大盒、4小盒共装148瓶，2大盒、5小盒共装100瓶，大盒与小盒每盒各装多少瓶？设大盒装x瓶，小盒装y瓶，则可列方程组（　　）

A． $\left\{\begin{array}{c}5x+4y=148\\ 2x+5y=100\end{array}\right.$B． $\left\{\begin{array}{c}4x+5y=148\\ 2x+5y=100\end{array}\right.$

C． $\left\{\begin{array}{c}5x+4y=148\\ 5x+2y=100\end{array}\right.$D． $\left\{\begin{array}{c}4x+5y=148\\ 5x+2y=100\end{array}\right.$