Discussion
What limits the positive output swing of a common-emitter stage?
Answer: A
The collector cannot go above the supply, so the upward swing is the difference between the supply and the quiescent collector voltage. Saturation voltage limits the downward swing instead. Base current and capacitor reactance limit the drive and the low-frequency response rather than the swing. Because the two directions are limited by different things, both have to be computed before the available output is known. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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