A solid cylinder of mass M and radius R rolls without slipping down an inclined plane of length L and height h. What is the speed of its centre of mass when the cylinder reaches its bottom -

Question

( A ) $\sqrt{\frac{4}{3}gh}$
( B ) $\sqrt{4gh}$
( C ) $\sqrt{\frac{3}{4}gh}$
( D ) $\sqrt{2gh}$