Discussion
Which single change would convert a DSB-SC transmitter into a full-carrier AM transmitter?
Answer: C
Adding back a carrier large enough that the envelope follows the message turns DSB-SC into full-carrier AM, which is exactly what deliberately unbalancing the modulator achieves. Removing a sideband would give SSB instead. A quadrature phase shift is a step in the phasing method of SSB generation. And raising the message amplitude without a carrier present does not create one; it merely scales the sidebands.
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