Discussion
Why does an emitter follower have a wide bandwidth?
Answer: B
With a voltage gain of one, the Miller factor is one plus one rather than one plus two hundred, so the input capacitance stays close to the device's own figure. The collector is indeed at signal earth, which is part of the same argument, and the impedances are real advantages but not the bandwidth mechanism. A stage that takes no voltage gain pays no Miller penalty, which is why followers are used to drive capacitive loads and to precede wideband stages.
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