When pumping fuel between an offshore supply vessel (OSV) and a MODU, there must be direct VHF radio contact between the offshore supply vessel engineer and the __________.

Correct Answer: Option B — person in charge of the fuel transfer

33 CFR 155.780 requires direct, reliable communication between the person in charge of the transfer on the MODU and the vessel's personnel. This ensures immediate coordination and the ability to execute an emergency shutdown of the transfer pumps if a leak or hazardous situation develops during the operation.