If you have to abandon ship, and enter a liferaft, your main course of action should be to __________.

Correct Answer: Option D — remain in the vicinity of the sinking vessel

Under MARPOL, SOLAS, and USCG Marine Engineering Safety regulations, regarding 'If you have to abandon ship, and enter a liferaft, your main course of action should be to', the mandated standard is: 'remain in the vicinity of the sinking vessel'.