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What is the maximum transmission efficiency of an AM signal?

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What is the maximum transmission efficiency of an AM signal?

(a) 33.33%

(b) 60.25%

(c) 38.75%

(d) 50.25%

This question was posed to me during an online interview.

This interesting question is from Amplitude Limiting in division Receivers & Transducers of Analog Communications

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The correct answer is (a) 33.33%

The best I can explain: The percentage of total power contributed by sidebands of the AM signal is known as transmission efficiency of an amplitude modulated system. The maximum transmission efficiency of an AM signal is 33.33%, thus suppressing the carrier which contains no useful information.

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