Through which coast radio station(s) may a U.S.-flag merchant vessel communicate?

Correct Answer: Option A — Any coast radio station in the world that is licensed to provide such communications.

Under international maritime law and ITU regulations, vessels are permitted to communicate with any licensed coast radio station globally. There is no requirement for U.S.-flag vessels to restrict their communications solely to U.S. stations, provided the coast station is authorized to provide public correspondence services in that region.