Discussion
What sets the accuracy of a simple two-device current mirror?
Answer: C
Two error sources dominate: how well the two devices match, and the two base currents drawn from the reference branch, which make the copied current slightly smaller. Supply and load affect the reference current and the compliance rather than the copying accuracy, and the resistor's coefficient affects the reference. Knowing which two mechanisms limit an arrangement is what tells you which improvement - better matching or a Wilson connection - is worth making.
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