Discussion
Why does a differential pair reject supply variation better than a single stage?
Answer: D
A change in the supply moves both sides of the pair together, so it appears at the output as a common-mode signal and is rejected by the same mechanism that rejects a shared input. The tail source does help, by holding the current constant, but the cancellation at the two collectors is the principal mechanism. That a symmetrical arrangement rejects anything affecting both halves equally is why the pair is used wherever interference and supply noise are expected. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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