Choose the correct statement.

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(C) In amplitude modulation $(AM)$,the amplitude of the high-frequency carrier wave is varied in accordance with the instantaneous amplitude of the mo

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In amplitude modulation,the amplitude of the high-frequency carrier wave is made to vary in proportion to the amplitude of the audio signal.

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(C) In amplitude modulation $(AM)$,the amplitude of the high-frequency carrier wave is varied in accordance with the instantaneous amplitude of the modulating (audio) signal,while the frequency and phase of the carrier remain constant.In frequency modulation $(FM)$,the frequency of the high-frequency carrier wave is varied in accordance with the instantaneous amplitude of the modulating signal,while the amplitude of the carrier remains constant.Therefore,option $C$ is the correct statement.

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