Risk of collision may exist（）. A.if the co
题型：单项选择题
问题：
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