Discussion
Taking the output between both collectors instead, that gain becomes about
Answer: D
A double-ended output collects both collectors' opposite excursions:
\[ A_{v(dd)} = 2 \times 100 = 200 \]
giving about 200, twice the single-ended figure, and with the common-mode movement cancelled as well. That one wiring choice buys both twice the gain and better rejection is why a differential output is preferred wherever the following stage can accept one.
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