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

Correct Answer: Option C — being towed

Under COLREG Rule 35(c), one prolonged and two short blasts indicate a vessel restricted in its ability to maneuver, sailing, fishing, or constrained by draft. A vessel being towed sounds one prolonged and three short blasts per Rule 35(e).