Discussion
Linear distortion in a channel means the output contains
Answer: B
A linear channel can change the amplitude and phase of each component but cannot create new frequencies, so linear distortion is amplitude or phase distortion across the band. Generating new frequencies is the signature of nonlinearity, which produces harmonics and intermodulation. Passing only the fundamental would be extreme filtering, which is one form of linear distortion rather than a category of its own. And a pure delay is distortionless, since it affects only the phase and does so linearly with frequency.
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