Discussion
What does a beat frequency oscillator make audible?
Answer: A
It reinserts a carrier so that continuous-wave Morse becomes an audible tone and single sideband becomes intelligible speech, both being modes with no carrier of their own to beat against. Frequency modulation needs a discriminator instead. Amplitude modulation already carries its own carrier and needs no help. And making internal harmonics audible is a defect rather than a purpose. A missing carrier has to be supplied somewhere, and doing it at the receiver is what these modes rely on.
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