A circular disc $X$ of radius $R$ is made from an iron plate of thickess $t$, and another disc $Y$ of radius $4R$ is made from an iron plate of thickness $t/4$. Then the relation between the moment of inertia $I_X$ and $I_Y$ is :

Question

( A ) $I_Y = 64 I_X$
( B ) $I_Y = 32 I_X$
( C ) $I_Y = 16 I_X$
( D ) $I_Y = I_X$