【单选题】
A Check antenna and feeder parts. Tighten the loosened connection or replace the aged or damaged part.
B Conduct drive tests to locate the interferencE、
C Modify the frequency: In a co-antenna feeder system, as one cell of a 2G system may employ several frequencies, intermodulation interference may occur among these frequencies.
D Chek the eNodeB device and replace the faulty components.
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