Discussion
Why does feedback reduce distortion generated inside the amplifier?
Answer: C
Distortion arising within the loop is fed back, compared with the input and largely cancelled, so it is divided by one plus the loop gain just as any other internal error is. The reduced drive is a consequence of the same mechanism rather than a separate one, no filtering occurs, and bias stability is a different matter. Any imperfection that arises inside a loop is reduced by the loop gain, and any that arises at the input is not - which is the distinction the next question turns on.
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