方程组 $\left\{\begin{array}{c}3x+2y=7\\ 6x-2y=11\end{array}\right.$ 的解是 $($ 　　 $)$

A．

$\left\{\begin{array}{c}x=-1\\ y=5\end{array}\right.$

B．

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

C．

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

D．

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