A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is -

Question

( A ) $\frac{2g}{3L}$
( B ) $\frac{g}{L}$
( C ) $\frac{3g}{2L}$
( D ) $\frac{2g}{L}$