A tank 36 ft. by 36 ft. by 6 ft. is filled with water to a depth of 5 ft. If a bulkhead is placed in the center of the tank running fore-and-aft along the 36-foot axis, how will the value of the moment of inertia of the free surface be affected?

A
The moment of inertia would remain unchanged.
B
The moment of inertia would be 1/4 its original value.
C
The moment of inertia would be 1/2 the original value.
D
None of the above
E