Solve the Problem $\pi$

A) 5,017,600/ 3 $\pi$ J
B) 2,508,800 /3

Multiple Choice

Solve the problem.
-A spherical water tank with an inner radius of 4 m has its lowest point 3 m above the ground. It is filled by a pipe that feeds the tank at its lowest point (see figure) . Neglecting the volume of the inflow pipe, how much work is required to fill the tank if it is initially empty? Express the answer in terms of $\pi$ .

A) 5,017,600/ 3 $\pi$ J
B) 2,508,800 /3 $\pi$ J
C) 627,200/3 $\pi$ J
D) 1,254,400/3 $\pi$ J