# One solid sphere A and another hollow sphere B are of same mass and same outer radii. Their moment of inertia about their diameters are respectively $I_A$ and $I_B$ such that <br> where $d_A$ and $d_B$ are their densities.
( A ) $I_A < I_B$
( B ) $I_A > I_B$
( C ) $I_A = I_B$
( D ) $I_A/I_B = d_A/d_B$