【单选题】
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
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