Discussion
Which shaping would make an FM system behave like a PM system?
Answer: B
A rising boost of six decibels per octave is a differentiation, and differentiating the message before an FM modulator gives PM. That is exactly the shape that broadcast pre-emphasis approximates over part of the band, which is why pre-emphasised FM and PM converge. De-emphasis is the inverse and would move FM further from PM. A flat response leaves FM as FM. And a notch would simply remove content.
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