Question 46

The Correct Answer is D ### Explanation for why option D ("All of the above") is correct: The fog signal of **one prolonged blast followed by two short blasts** is mandated by Rule 35(c) and 35(h) of both the International and Inland Rules of the Road (COLREGs). This signal is reserved for specific vessels that, due to their maneuvering capabilities or status, require other vessels to be extra vigilant. 1. **A vessel not under command (Option C)**: Rule 35(c) explicitly lists a vessel not under command as required to sound this signal. 2. **A sailing vessel underway (Option B)**: Rule 35(c) explicitly lists a sailing vessel as required to sound this signal. 3. **A vessel restricted in its ability to maneuver, at anchor (Option A)**: Rule 35(h) dictates that a vessel restricted in its ability to maneuver, when at anchor, must sound the bell signal prescribed in 35(g) but **must also sound the signal of one prolonged followed by two short blasts** (in addition to the rapid ringing of the bell). Since the signal is required for the vessels described in A, B, and C, **D (All of the above)** is the comprehensive and correct answer. ### Explanation of why options A, B, and C are individually incorrect (as the final answer): While vessels A, B, and C are all legally **required** to sound the specific fog signal (meaning the statements themselves are true), they are **incomplete** answers to the multiple-choice question. Choosing only A, B, or C would omit other vessel types listed in the options that also must sound the signal. Since D encompasses all three correct possibilities, D is the only correct choice for the overall question.