You are towing a 1,000 GT gasoline tank barge which is not gas free. By regulation, cargo tank hatches, ullage holes, and Butterworth plates on the barge may __________.

Correct Answer: Option B — be open without flame screens under the supervision of the senior crew member on duty

Title 46 CFR permits cargo tank openings on non-gas-free tank barges to be uncovered without flame screens only when explicitly executed under the direct supervision of the senior crew member on duty to maintain strict fire safety protocols.