Which statement is TRUE concerning the ventilation of engine and fuel tank compartments on uninspected towing vessels using fuel with a flash point of 100°F?

Correct Answer: Option B — At least one exhaust duct shall extend from the open atmosphere to the lower portion of the bilge.

Marine engineering safety standards mandated by 46 CFR require that at least one exhaust ventilation duct extends down into the lower portion of the bilge to effectively evacuate heavier-than-air flammable fuel vapors.