Discussion
Why does the feedback network's own tolerance matter so much?
Answer: B
With a large loop gain the closed-loop gain is the reciprocal of the feedback fraction, so the network's component tolerances appear directly in the answer with no reduction whatever. It carries a small fraction of the output current, its noise is not amplified by the full open-loop gain, and stray capacitance affects stability separately. Feedback transfers the accuracy requirement from the devices to a handful of passive components, and those components must then be worth trusting.
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