Discussion
That stage's input impedance at the base with \( \beta = 120 \) is about
Answer: A
The whole emitter resistance reflects to the base:
\[ r_{in} = 120 \times (220+26) \approx 30 \ \mathrm{k\Omega} \]
so about 30 kilohms, before the bias divider is placed in parallel with it. Degeneration has raised the input impedance by the same factor of nine that it lowered the gain, which is the reciprocal relation series feedback always produces.
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