单项选择题

From your position you observe a rotating white and green light to the north. This light is most likely（）.

A.at an airport
B.on a naval mine-countermeasures vessel
C.Block Island North Light
D.on a vessel engaged in public safety activity

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船舶强度资料

From your position you observe a rotating white and green light to the north. This light is most likely（）.