Question 4747 Deck General

The correct answer is D) using an on board crane to lift a freely swinging heavy object. The reason this is correct is that when a heavy object is lifted by a crane, the object's center of gravity rises, which in turn raises the overall center of gravity of the Mobile Offshore Drilling Unit (MODU). This change in the center of gravity can affect the MODU's stability and must be accounted for during operations. The other options are incorrect because transferring pipe (A) or filling/emptying a tank (B, C) would not directly affect the center of gravity in the same way as lifting a heavy object with a crane (D).