Discussion
What defines a class D amplifier?
Answer: C
A class D stage switches its devices fully on or fully off at a high rate, encoding the signal in the duty cycle and recovering it with a low-pass filter. A switch dissipates little because it never carries current and voltage together, which is where the efficiency comes from. Conduction angle is not how the switching classes are described, and neither deep class A nor a transformer is involved. Moving from a linear device to a switch is the same step that transformed power supplies.
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