On offshore drilling units, a fire drill must be conducted at least once a __________.

Correct Answer: Option B — week

Under 46 CFR 109.213(b), the person in charge of a mobile offshore drilling unit (MODU) must ensure that a fire drill is conducted at least once every week. Weekly drills ensure that all crew members on rotating shifts maintain high operational readiness and familiarity with emergency station assignments and firefighting procedures.