Discussion
A square-law detector produces distortion because its output contains
Answer: A
Squaring the input produces the message together with a term proportional to the message squared, which is second-harmonic distortion; it is small only when the modulation index is small. That is why the square-law detector is used for weak signals and in measurement rather than in broadcast receivers. The carrier is removed by the output filter. Components at twice the carrier are filtered out. And the whole point is that baseband output does appear.
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