单选题If you saw flames aboard a vessel but could see the vessel was not on fire，you would know that the（）.Acrew was trying to get warmBvessel required immediate assistanceCvessel was attempting to attract the attention of a pilot boatDvessel was being illuminated for identification by aircraft
单选题
If you saw flames aboard a vessel but could see the vessel was not on fire，you would know that the（）.
A
crew was trying to get warm
B
vessel required immediate assistance
C
vessel was attempting to attract the attention of a pilot boat
D
vessel was being illuminated for identification by aircraft
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