When returning from sea in US waters, a vessel should keep nun buoys on which side?

A. Port side
B. Either side, depending on the channel
✓ Starboard sideCorrect
D. The side indicated by the buoy's light characteristic

Why C is correct

Nun buoys are red, conical, even-numbered starboard-side aids in the US lateral system. Under IALA-B, they are kept on the starboard side when returning from sea.

Cited:Light List — Nun Buoy Bowditch Ch. 5 §501

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When returning from sea in US waters, a vessel should keep nun buoy… — USCG Exam Practice · CaptainsGround