In accordance with U.S. regulations, no vessel can come or remain alongside a tank vessel while it is loading A, B, or C grade cargo without permission from whom?

Correct Answer: Option C — officer-in-charge of the vessel which is loading

Title 46 CFR regulations prohibit vessels from coming or remaining alongside a tank vessel loading grade A, B, or C flammable cargoes without explicit permission from the person-in-charge or officer-in-charge of the loading vessel.