When flammable liquids are handled in a compartment on a vessel, the ventilation for that area should be __________.

Correct Answer: Option D — operated continuously while vapors may be present

Continuous ventilation ensures flammable vapors remain below the lower explosive limit (LEL) during handling. Under 46 CFR, spaces handling flammable liquids must maintain uninterrupted mechanical exhaust to prevent dangerous vapor accumulations and subsequent ignition hazards.