BOTH INTERNATIONAL & INLAND Vessel "A", a power driven vessel underway, sights vessel "B" which is a vessel underway and fishing as shown in illustration D014RR below. Which statement is true?

Correct Answer: Option C — Vessel "A" must keep out of the way of vessel "B" because "B" is fishing.

Rule 18(a)(iii) establishes that a power-driven vessel underway must keep out of the way of a vessel engaged in fishing, superseding standard crossing hierarchies based on relative bearings.