If $A + B + C = 0$, then $\sin^2A + \sin^2B + \sin^2C$ is equal to :

Question

( A ) $2 + \cos A \cos B \cos C$
( B ) $2+2 \cos A \cos B \cos C$
( C ) $2-2 \sin A \sin B \sin C$
( D ) $2-2 \cos A \cos B \cos C$