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

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

Why C is correct

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

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

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