Discussion
Why does a stiff bias divider hurt the input impedance so much?
Answer: C
The two requirements pull directly against each other: a stiff divider is by definition a low resistance, and it sits in parallel with the signal input. Base current and reflected resistance are unaffected by the divider's value. Loading the previous stage is the consequence rather than the mechanism. When two specifications depend oppositely on one component value, the choice is a compromise and stating both sides is what makes it deliberate. Working one numerical case through both schemes side by side fixes the distinction better than any rule of thumb. Working one numerical case through both schemes side by side fixes the distinction better than any rule of thumb.
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