Discussion
Which scheme's bandwidth is directly proportional to the message frequency?
Answer: B
For PM the bandwidth is twice the message frequency times one plus the index, and since the index does not depend on that frequency, the whole expression scales with it. FM's bandwidth grows with message frequency too but only through the additive term, so it is not proportional. AM's bandwidth is twice the highest message frequency, which is a proportionality to the highest frequency rather than a per-tone one. And SSB occupies the message bandwidth itself. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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