Discussion
The distortion produced by over-modulation appears as
Answer: B
The envelope cannot go below zero, so the troughs clip flat and the detector recovers a distorted waveform rich in harmonics that also spread the transmitted spectrum well beyond the nominal channel. The carrier frequency is unaffected. Bandwidth increases rather than reduces, which is precisely the interference problem. And the phase reversal that occurs is exactly what a diode envelope detector cannot follow, so the message certainly is changed.
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