Discussion
What is the efficiency penalty of low-level modulation?
Answer: D
Once the signal carries a varying envelope, all subsequent amplification must be linear, which rules out the efficient class C operation an unmodulated carrier permits. That is the whole trade against high-level modulation. The oscillator is never pulled in an amplitude scheme. Antenna tuning is unaffected by modulation. And it is high-level modulation, not low-level, that demands a powerful audio stage. Tracing the consequence of a design choice through the whole chain is what these questions test.
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