Discussion
The envelope of a DSB-SC signal for a tone message is
Answer: B
With no carrier to bias it, the envelope follows the magnitude of the message, so it looks like a full-wave rectified tone repeating at twice the message frequency, and the carrier phase reverses at each null. That is exactly why a simple envelope detector recovers the wrong waveform. The tone itself appears as the envelope only when a large carrier is added. A constant envelope belongs to angle modulation. And a square envelope would need a square-wave message.
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