You see a vessel displaying three lights in a vertical

单项选择题

You see a vessel displaying three lights in a vertical line.The highest and lowest lights are red and the middle light is white.She is also showing a white light at the stern，which is lower than the forward light.It could be a（）.

A.Survey vessel
B.Vessel not under command
C.Vessel aground
D.Pilot vessel with port side to you

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海上避碰规则