Small oil spills on deck can be prevented from contaminating any waters by __________.

Correct Answer: Option A — plugging all scuppers and drains

Plugging scuppers and drains is the most effective way to contain a spill on deck. By sealing these openings, you prevent oil from entering the overboard discharge system or reaching the water. This is a mandatory pre-transfer requirement under 33 CFR 155.770 to ensure containment of potential leaks.