BOTH INTERNATIONAL & INLAND Which signal shall a vessel being towed, if manned, sound while in fog?

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

Rule 35(e) requires that a vessel being towed, or if more than one vessel is towed, the last vessel of the tow, if manned, shall sound one prolonged blast followed by three short blasts at intervals of not more than two minutes, immediately after the signal of the towing vessel.