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# In frequency modulation (FM) the

$\begin{array}{1 1}(a)\;\text{frequency of carrier wave is changed according to frequency of signal}\\(b)\; \text{frequency of signal wave is changed according to frequency of carrier wave}\\(c)\;\text{frequency of carrier wave changed according to intensity of signal}\\(d)\;\text{frequency of carrier wave does not change}\end{array}$

In FM the frequency of carrier wave is changed according to intensity or amplitude of the signal.The amplitude of carrier wave is kept constant.
Hence (c) is the correct answer.