According to Coast Guard Regulations (46 CFR), the fuel tanks of motor-propelled lifeboats shall be __________.

Correct Answer: Option C — emptied and the fuel changed at least once each year

46 CFR 160.035 requires that motor-propelled lifeboat fuel tanks be emptied and the fuel replaced at least annually. This regulation prevents fuel degradation, gumming of injectors, and potential engine failure, ensuring the lifeboat remains in a state of readiness for immediate deployment during an emergency abandonment.