If $A+B+C=\pi$ then $\sin 2A+\sin 2B-\sin 2C$ is equal to

Question

$\begin{array}{1 1}(a)\;4\sin A\sin B\sin C&(b)\;4\cos A\cos B\sin C\\(c)\;4\cos A\cos B\cos C&(d)\;None\;of\;these\end{array}$