Discussion
Which stage would you place ahead of a high-gain common-emitter stage to widen its bandwidth?
Answer: C
A follower presents a low output impedance, and since the Miller break is set by the product of source resistance and multiplied capacitance, a stiffer drive raises it directly. Another common-emitter stage would have a high output impedance itself, a common-base stage is driven at its emitter rather than its base, and a shunt-peaked stage addresses its own load rather than the next stage's input. Attacking whichever factor of a product is cheapest to change is the general strategy, and here it is the source impedance.
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