Discussion
Its Thevenin resistance is about
Answer: A
The two arms appear in parallel to the base:
\[ \begin{aligned} R_{th} &= \frac{47 \times 10}{57} \\ &\approx 8.2 \ \mathrm{k\Omega} \end{aligned} \]
so about 8.2 kilohms. For a stiff divider this must be well below the impedance looking into the base, which with a 1.2 k emitter resistor and a beta of 100 is over 120 k - so the condition is comfortably met. Computing both numbers and comparing them is the whole stiffness check.
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