Discussion
Which pairing correctly matches a scheme to its dominant limitation?
Answer: C
FM's cost is bandwidth and SSB's is the demand it places on frequency accuracy, each being the price of that scheme's particular advantage. Reversing them misstates both. FM's receiver is more complex than AM's but that is not its dominant limitation. And SSB's power efficiency is excellent rather than limiting. Matching each scheme to its single binding constraint is a compact way to hold the whole comparison in mind.
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