SOLAS requires a logbook entry for the operation of watertight door drills. Which of the following lists the frequency that these drills are required to be conducted for passenger vessels?

Correct Answer: Option A — weekly

SOLAS Chapter II-1, Regulation 21 requires that watertight doors, including those in the machinery spaces and cargo holds, be operated daily. For passenger vessels, this ensures that all doors are in working order and that the crew remains proficient in their operation during an emergency.