单选题If you are the stand-on vessel in a crossing situation，you may take action to avoid collision by your maneuver alone. When may this action be taken?（）.AAt any time you feel it is appropriateBOnly when you have reached extremisCWhen you determine that your present course will cross ahead of the other vesselDWhen it becomes apparent to you that the give-way vessel is not taking appropriate action
单选题
If you are the stand-on vessel in a crossing situation，you may take action to avoid collision by your maneuver alone. When may this action be taken?（）.
A
At any time you feel it is appropriate
B
Only when you have reached extremis
C
When you determine that your present course will cross ahead of the other vessel
D
When it becomes apparent to you that the give-way vessel is not taking appropriate action
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