【单选题】
A 右转30度，向前飞行20公里 Right turn 30 degrees and and proceed with the new heading 20KM
B 左转90度，偏离航线20海里 Left turn 90 degrees and offset 20NM from the original route
C 右转90度，偏离航线15公里 Right turn 90 degrees and offset 15NM from the original route
D 左转30度，向前飞行15海里 Left turn 30 degrees and and proceed with the new heading 15NM
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