Discussion
In phase modulation the carrier's phase deviates
Answer: A
Phase modulation makes the phase departure proportional to the message amplitude, which is the exact analogue of frequency modulation's deviation proportional to amplitude. Proportionality to message frequency describes no useful scheme. Proportionality to the integral describes frequency modulation expressed as a phase, which is the dual case. And proportionality to the derivative would be FM written the other way round. Fixing which quantity is proportional to what is the whole basis of telling the two angle modulations apart.
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