BOTH INTERNATIONAL & INLAND Which light(s) is/are a power-driven vessel towing astern required to show?

Correct Answer: Option A — a towing light in a vertical line above the stern light

Rule 24(c) requires a power-driven vessel towing astern to display a towing light in a vertical line above the stern light. This specific arrangement provides a clear visual indication of the towing operation, allowing other vessels to identify the towline and avoid passing between the tug and the tow.