Discussion
A stage's gain is much lower than designed although its quiescent point is correct. Which fault fits?
Answer: B
A correct operating point with a low gain means the direct conditions are right and only the signal path is wrong, so the emitter resistor is no longer bypassed and is degenerating the gain. A soft divider or a wrong emitter resistor would shift the quiescent point too, and a low supply would reduce the swing rather than the gain. Separating faults that move the bias from faults that only affect signals halves the search immediately. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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