Discussion
Why was the quasi-complementary arrangement used historically?
Answer: C
Early power transistors were almost all NPN, so the negative half was handled by an NPN output device driven by a PNP driver, making the pair behave as a composite PNP. Efficiency and device count are unchanged, and drivers are still needed. A workaround adopted because one component did not exist is worth recognising as such, since it explains circuits that would otherwise look perverse.
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