An audio signal represented as \( 25 \sin 2 \pi(2000 \mathrm{t}) \) amplitude modulated by a car...

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An audio signal represented as \( 25 \sin 2 \pi(2000 \mathrm{t}) \) amplitude modulated by a carrier wave : \( 60 \sin 2 \pi(100,000) \) t. The modulation index of the modulated signal is
(a) \( 25 \% \)
(b) \( 41.6 \% \)
(c) \( 50 \% \)
(d) \( 75 \% \)
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