A rectangular block of mass m and area of cross- section A floats in a liquid of density ?. If it given a small vertical displacement from equilibrium it undergoes oscillation with a time period T. Then:-

Question

( A ) $T\propto {\sqrt \rho }$
( B ) $T\propto \frac{1} {\sqrt m}$
( C ) $T\propto \frac{1}{\sqrt A}$
( D ) $T\propto \frac{1} \rho$