Discussion
The maximum each device in that stage must dissipate is about
Answer: B
Class B dissipation peaks at about two thirds of full swing:
\[ \begin{aligned} P_{d} &= \frac{V_{cc}^{2}}{\pi^{2}R} \\ &\approx \frac{576}{79} \\ &\approx 7.3 \ \mathrm{W} \end{aligned} \]
which is about 7.3 W per device, roughly a fifth of the output power. Sizing the heatsink from the full-output condition instead would badly understate the requirement, since dissipation there is much lower - which is the practical reason the peak's position matters. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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