INTERNATIONAL ONLY You are underway in fog and hear a fog signal consisting of one prolonged and two short blasts. It could be any of the following EXCEPT a vessel __________.

Correct Answer: Option A — being towed

COLREG Rule 35(c) prescribes one prolonged followed by two short blasts for vessels restricted in their ability to maneuver, engaged in fishing, or towing, whereas a vessel being towed sounds one prolonged and three short blasts under Rule 35(e).