Question 996 Rules of the Road

The correct answer is B) One prolonged and two short blasts. According to the International Regulations for Preventing Collisions at Sea (COLREGS), a sailing vessel with the wind abaft the beam (behind the beam) navigating in fog is required to sound the signal of "one prolonged blast followed by two short blasts" at intervals not exceeding 2 minutes. This signal indicates the vessel's presence and her forward movement in the fog. The other answer choices are incorrect because they do not match the specific signal required by the COLREGS for a sailing vessel with the wind abaft the beam in fog.