Correct Answer - A

The volumetric strain `(delta v) = - (rho)/(B)`,

where `P = rho gh` Then, `- (delta v)/(v) = (pgh)/(B)`

Since the volume of the sphere is `v = (4)/(3) pi r^(3)`,

We have `(delta v)/(v) = (3delta r)/(r)` Using eqs(i) and (ii)

we have `(delta r)/(r) = (rho gh)/(3B)`