BOTH INTERNATIONAL & INLAND A tug is towing three manned barges in line in fog. Which signal is the third barge of the tow required to sound?

Correct Answer: Option C — One prolonged and three short blasts

Rule 35(c) mandates that when a vessel is being towed, the last vessel of the tow, if manned, shall sound one prolonged and three short blasts. This signal must be sounded immediately after the signal of the towing vessel, providing acoustic identification of the tow's end in restricted visibility.