Explanation: FCC regulations governing ship radio stations, specifically Part 80, permit an unlicensed person to speak over the transmitter when under the direct supervision of the licensed operator. The licensed operator maintains full responsibility for the station's proper operation, including adherence to all rules and regulations, and must be present and capable of immediately taking control of the transmitting apparatus. This ensures that all transmissions comply with regulatory requirements, even if the voice is not that of the license holder. Option A is incorrect because supervised operation by an unlicensed person is explicitly permitted. Option B is irrelevant; station power limits do not dictate who can speak, only supervision does. Option D is incorrect as lack of supervision, such as when a radio officer is off duty, prohibits an unlicensed person from transmitting.