Discussion
The maximum output power that stage can deliver to a load is about
Answer: C
Class A with a resistive load reaches at best a quarter of the input power:
\[ P_{out} \le 0.25 \times 240 = 60 \ \mathrm{mW} \]
so about 60 milliwatts. Transformer coupling raises the ceiling to fifty per cent by removing the standing drop across the collector resistor, which is exactly why output transformers persisted as long as they did. A theoretical efficiency limit is worth attaching to its coupling arrangement rather than to the class alone.
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