Discussion
The envelope of an AM waveform carries
Answer: B
The envelope reproduces the message, which is exactly why a simple diode detector recovers it: rectify, smooth, and the message appears. That simplicity is AM's great advantage and the reason broadcast receivers could be made cheaply for a century. The carrier frequency is the rate at which the waveform oscillates inside the envelope. The sideband frequencies are properties of the spectrum. And no local oscillator is involved in envelope detection at all.
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