The Master may require part of the crew to work when needed for __________.

Correct Answer: Option D — All of the above

Under 46 U.S.C. 8104, the Master is authorized to require crew members to perform duties beyond standard watch hours when necessary for the safety of the vessel, passengers, crew, or cargo. This includes critical operations like maneuvering, mooring, and mandatory safety drills, which are essential for maintaining vessel integrity.