BOTH INTERNATIONAL & INLAND On open waters, a power-driven vessel shall keep out of the way of which of the following?

Correct Answer: Option A — a sailing vessel

Rule 18(a)(iv) explicitly states that a power-driven vessel underway shall keep out of the way of a sailing vessel. This hierarchy is fundamental to the Rules, ensuring that less maneuverable vessels or those relying on wind power are given the right of way over power-driven vessels.