If your passenger vessel is fitted with a loudspeaker system, it must be tested at least once __________.

Correct Answer: Option A — every week

46 CFR 185.510 mandates that the public address system, if fitted, must be tested at least once every week. This ensures the equipment remains functional for emergency communications, as reliable internal signaling is critical for passenger safety and effective crew coordination during potential vessel emergencies or abandon ship drills.