While the piston is at a distance 2L from the top, the hole at the top is sealed. The piston is then released, to a position where it can stay in equilibrium. In this condition, the distance of the piston from the top is

A

$$\left(\frac{2P_0\pi R^2}{\pi R^2 P_0 + Mg}\right)(2L)$$

B

$$\left(\frac{P_0\pi R^2 - Mg}{\pi R^2 P_0}\right)(2L)$$

C

$$\left(\frac{P_0\pi R^2 + Mg}{\pi R^2 P_0}\right)(2L)$$

D

$$\left(\frac{P_0\pi R^2}{\pi R^2 P_0 - Mg}\right)(2L)$$