Discussion
Why is a stage's voltage gain more predictable than its input impedance?
Answer: D
Transconductance depends only on the operating current, whereas input resistance is beta times the emitter resistance and so inherits beta's threefold spread. Frequency and amplitude are separate matters, and the supply does not set the gain. A specification that avoids the unreliable parameter is worth trusting, and knowing which specifications do is part of knowing what a data sheet is telling you. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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