Discussion
Why does a common-gate stage have a wide bandwidth?
Answer: B
With the gate common, the gate-drain capacitance no longer bridges input and output across an inverting gain, so there is no Miller multiplication - precisely the common-base argument. The capacitance itself is a device property unchanged by configuration, and the transconductance does not rise with frequency. Bandwidth is about which capacitance sees which gain, in either device family.
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