Discussion
What happens when a large differential input is applied?
Answer: D
Beyond a difference of a hundred millivolts or so the pair is fully steered: one device takes the entire tail current and the other is off. The tail current is fixed by its source and cannot double, and both devices cannot carry it all or be off together. That full steering happens at such a small input is why a differential pair makes a good comparator and why an amplifier must keep its input difference far smaller.
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