Question 593 Rules of the Road

The correct answer is B) pushing vessel and a vessel being pushed, when they are in a composite unit. This is correct because the International and Inland Navigation Rules state that when a power-driven vessel is pushing another vessel or a vessel being pushed is in a composite unit, they are required to exhibit the same navigation lights as a single power-driven vessel. This includes the masthead lights, sidelights, and sternlight. The other options are incorrect because they do not represent the specific lighting requirements for a power-driven vessel in a composite pushing unit, which is the situation described in the question.