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What is the maximum transmission efficiency?

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What is the maximum transmission efficiency?

(a) 67.88%

(b) 33.33%

(c) 73%

(d) 54.03%

The question was asked in an international level competition.

This intriguing question comes from Transmitter in chapter Elements of Communication System of Analog Communications

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Right choice is (b) 33.33%

To explain I would say: The maximum transmission efficiency is 33.33%. It is so because 2/3rd of the total power is contained in the carrier, which conveys no useful information. Thus, only 1/3rd of total power has useful information which is transmitted. This happens in the case of SSB-SC Modulation, where the carrier is suppressed and only either of the sidebands is allowed to pass.

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