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What is the maximum efficiency of a class B circuit?

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What is the maximum efficiency of a class B circuit?

(a) 90%

(b) 78.5%

(c) 40%

(d) 50%

I got this question at a job interview.

Asked question is from Classification of Output Stages topic in portion Differential and Multistage Amplifiers of Electronic Devices & Circuits

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The correct choice is (b) 78.5%

The best I can explain: The conduction angle is 180° for a Class B amplifier. Since the active device is switched off for half the input cycle, the active device dissipates less power and hence the efficiency is enhanced. Theoretical maximum efficiency of Class B power amplifier is 78.5%.

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