Discussion
The modulation index of a phase-modulated signal is
Answer: B
For PM the index is simply the peak phase deviation, measured in radians, and it depends on the message amplitude alone. The second option is the FM index, which carries an extra division by the message frequency. Frequency deviation in hertz is an FM parameter with the wrong units for a phase. And the carrier's own phase has no fixed value to form a ratio with. That the PM index is dimensionless and frequency-independent is its most consequential difference from FM.
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