INTERNATIONAL ONLY Of the vessels listed, which must keep out of the way of all the others?

Correct Answer: Option B — A vessel pushing a barge

COLREG Rule 18 establishes the hierarchy of vessels. A vessel pushing a barge is a power-driven vessel and does not possess special status. It must keep out of the way of vessels with higher priority, such as those restricted in their ability to maneuver or constrained by draft.