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(B) In a transistor, the power gain is defined as the product of current gain $(\beta)$ and voltage gain $(A_v)$.In a $Common 	ext{ } Emitter$ $(CE)$

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Common emitter configuration

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(B) In a transistor, the power gain is defined as the product of current gain $(\beta)$ and voltage gain $(A_v)$.In a $Common 	ext{ } Emitter$ $(CE)$ configuration, both the current gain $(\beta)$ and the voltage gain are significantly greater than $1$.Since the $CE$ configuration provides both high current gain and high voltage gain, it results in a high power gain.Therefore, transistors provide good power amplification when they are used in the $Common 	ext{ } Emitter$ configuration.

The transistors provide good power amplification when they are used in

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