Question 1002 Rules of the Road

The correct answer is B) One prolonged blast and two short blasts. According to the Navigation Rules, International and Inland, Rule 35(c), a vessel that is towing another vessel while underway must sound "one prolonged blast followed by two short blasts at intervals of not more than 2 minutes" when operating in conditions of restricted visibility. The other options are incorrect because they do not match the specific signal required for a vessel that is towing another vessel in fog. Option A, three distinct blasts, is the signal for a vessel not under command, while options C and D are for vessels not towing.