Vessels required to be equipped with an approved backfire flame arrester are __________.

Correct Answer: Option C — all those with gasoline engines

46 CFR 182.415 mandates that all gasoline engines must be equipped with an acceptable means of backfire flame control. This is a critical fire prevention measure, as gasoline engines can produce backfires that could ignite fuel vapors in the engine compartment, leading to catastrophic vessel fires or explosions.