Choose the correct statement.
A. In the frequency modulation,the amplitude of high frequency carrier wave is mode to vary in proportion to the frequency of audio signal.
B. In amplitude modulation, the amplitude of the high frequency carrier wave is made to vary in proportion to the amplitude of the audio signal.
C. In amplitude modulation, the frequency or the high frequency carrier wave is made to vary in proportion to the amplitude of audio signal.
D. In frequency modulation, the amplitude of the high frequency carrier wave is made to vary in proportion to the amplitude of audio signal.
