Discussion
Why is a comparator's input stage also a differential pair?
Answer: C
A comparator asks which of two voltages is larger, which is precisely a question about their difference, so the same arrangement serves. Rejection and low offset are welcome and offset in particular sets the comparator's resolution, but the structural reason is the difference. Compensation is exactly what a comparator does not want, since it is designed to switch as fast as possible rather than to be stable in a loop.
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