There are two identical small holes of area of cross-section a on the opposite sides of a tank containing a liquid of density \[\rho \]. The difference in height between the holes is h. Tank is resting on a smooth horizontal surface. Horizontal force which will has to be applied on the tank to keep it in equilibrium is

• A.             \[gh\rho a\]
• B.             \[\frac{2gh}{\rho \,a}\]
• C.             \[2\rho agh\]
• D.             \[\frac{\rho gh}{a}\]