The moment of inertia of uniform semicircular disc of mass M and radius r about a line perpendicular to the plane of the disc through the centre is :

Question

( A ) $\frac{1}{2} Mr^2$
( B ) $\frac{1}{4} Mr^2$
( C ) $\frac{1}{2} Mr^2$
( D ) $\frac{2}{5} Mr^2$