Discussion
Why is collector leakage more troublesome in the common-emitter configuration?
Answer: D
In common emitter the leakage appears in the base circuit and is amplified by beta, so a microamp of junction leakage becomes a hundred microamps of collector current. Its direction is the same as the signal current, it does not appear across the input, and the voltage dependence is weak. Any unwanted quantity that enters at the input of an amplifier is multiplied by the gain, which is the general reason input-referred imperfections matter most. Working one numerical case through both schemes side by side fixes the distinction better than any rule of thumb.
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