Discussion
In FM, when frequency deviation doubled, then
Answer: B
When the frequency deviation in FM is doubled, the modulation index is doubled.
The modulation index is the frequency deviation divided by the modulating frequency. If the modulating frequency is unchanged, doubling the deviation doubles the index.
Decreasing it, halving it or leaving it unchanged would each require the deviation to fall, to be halved or to stay the same, which is not what is stated.
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