Discussion
Why is a small-signal model tied to an operating point?
Answer: B
Every element in the model is a derivative evaluated at one point, so moving the operating point changes them all - the transconductance most obviously, being proportional to the collector current. Test conditions are a data sheet matter, and the last option states a true fact about superposition without explaining the dependence. A linearisation is only as valid as the point it was taken about, which is why bias and signal analysis have to be done in that order.
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