Discussion
Why does a Wilson mirror copy a current more accurately than a simple one?
Answer: B
The third device senses the output current and adjusts the drive, so the base currents that a simple two-device mirror loses are largely compensated. Matching is still between devices, the current is a design choice, and it needs more headroom rather than less. Adding feedback around a copying arrangement to cancel its principal error is the same idea that makes an operational amplifier accurate, applied here to a current rather than a voltage.
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