单选题Risk of collision may exist（）.Aif the compass bearing of an approaching vessel does not appreciably changeBeven when an appreciable bearing change is evident, particularly when approaching a vessel at close rangeCif you observe both sidelights of a vessel ahead for an extended period of timeDAll of the above
单选题
Risk of collision may exist（）.
A
if the compass bearing of an approaching vessel does not appreciably change
B
even when an appreciable bearing change is evident, particularly when approaching a vessel at close range
C
if you observe both sidelights of a vessel ahead for an extended period of time
D
All of the above
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