BOTH INTERNATIONAL & INLAND Which vessel shall not impede the passage of a vessel which can only navigate inside a narrow channel?

Correct Answer: Option C — A vessel of less than 20 meters in length

Rule 9(b) states that a vessel of less than 20 meters in length or a sailing vessel shall not impede the passage of a vessel which can safely navigate only within a narrow channel or fairway. This priority ensures the safety of deep-draft vessels restricted by channel geometry.