A virtual rise in the center of gravity of a MODU may be caused by __________.

Correct Answer: Option D — using an on board crane to lift a freely swinging heavy object

Under MARPOL, SOLAS, and USCG Marine Engineering Safety regulations, regarding 'A virtual rise in the center of gravity of a MODU may be caused by', the mandated standard is: 'using an onboard crane to lift a freely swinging heavy object'.