WBJEE 2018 Physics Solved Paper

A spherical liquid drop is placed on a horizontal plane. A small disturbance causes the volume of thedrop to oscillate. The time period of oscillation (T) of the liquid drop depends on radius (r) of the drop,density (ρ) and surface tension (s) of the liquid. Which among the following will be a possibleexpression for T (where k is a dimensionless constant) ?