On small passenger vessels, cooling water for the exhaust lines from an internal combustion engine must be __________.

Correct Answer: Option D — obtained from the engine's cooling water system or from a separate engine-driven pump

46 CFR 182.425 requires that exhaust cooling water be supplied by the engine's integral cooling system or a dedicated engine-driven pump. This ensures that the exhaust system remains adequately cooled during operation, preventing overheating of the exhaust piping and reducing the risk of fire in the engine space.