Discussion
Which pair of requirements pulls the choice of intermediate frequency in opposite directions?
Answer: B
A high intermediate frequency improves image rejection, while a low one makes narrow, steep-skirted adjacent channel filtering far easier to build, and no single frequency does both well. That conflict is why 455 kHz became the compromise for broadcast AM and why double conversion exists at all. The other three pairs name real requirements that do not compete over this particular choice. Recognising which two requirements a design parameter is caught between is what makes its value comprehensible.
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