单项选择题

A vessel is overtaking when she can see which light(s) of a vessel ahead?（）

A.Only the stern light of the vessel
B.One sidelight and a masthead light of the vessel
C.Only a sidelight of the vessel
D.The masthead lights of the vessel

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救助合同与救助公约

A vessel is overtaking when she can see which light(s) of a vessel ahead?（）