If a vessel moored at a U.S. terminal does not comply with Coast Guard Pollution Prevention Regulations (33 CFR), it may be detained by the __________.

Correct Answer: Option D — captain of the port

Under 33 CFR 155.130, the Captain of the Port (COTP) has the authority to detain any vessel that fails to comply with pollution prevention regulations. This enforcement action is taken to prevent environmental damage and ensure that vessels operating in U.S. waters meet all safety and pollution standards.