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Which of the power amplifiers has the lowest overall efficiency?

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Which of the power amplifiers has the lowest overall efficiency?

(a) Class C

(b) Class A

(c) Class B or AB

(d) Class D

The question was posed to me during an interview for a job.

I need to ask this question from Classification of Output Stages topic in chapter Differential and Multistage Amplifiers of Electronic Devices & Circuits

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The correct answer is (b) Class A

The best I can explain: The efficiency of this type of circuit is very low (less than 30%) and delivers small power outputs for a large drain on the DC power supply. A Class A amplifier stage passes the same load current even when no input signal is applied so large heat sinks are needed for the output transistors.

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