If $\cos \alpha+\cos \beta + \cos \gamma=0= \sin \alpha +\sin \beta + \sin \gamma$ then $\sin^2 \alpha +\sin ^2 \beta +\sin ^2 \gamma$

Question

$\begin{array}{1 1} \large\frac{1}{2} \\ \large\frac{3}{2} \\ 4 \\ 1 \end{array}$