Discussion
Which configuration has the highest power gain?
Answer: B
Common emitter offers both voltage and current gain, so their product is the largest of the three - typically tens of thousands. Common base gives voltage gain with a current gain just under one, and common collector the reverse, so each is limited to roughly the one gain it has. That the default choice for a general amplifier stage is also the one with the highest power gain is no accident, and it is the reason it became the default.
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