【单选题】
A Flight safety is an important factor in the introduction of readback procedures
B The readback procedures can hardly ensure an understanding in the transmission and receipt of ATC clearances and instructions
C Readback procedures serve as a cross-check for the accuracy and correctness of the transmission and receipt of ATC clearance and instructions
D Strict adherence to readback procedures serves as a check that the single appropriate aircraft will take action on the clearance
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