单选题If there is sufficient sea room，alteration of（）may be the most effective action to avoid close-quarters situation.Aspeed and courseBspeed aloneCcourse aloneDspeed or course
单选题
If there is sufficient sea room，alteration of（）may be the most effective action to avoid close-quarters situation.
A
speed and course
B
speed alone
C
course alone
D
speed or course
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