Discussion
A receiver plays a strong local station across most of the tuning dial.
Which fault does this suggest?
Answer: D
Hearing one station everywhere means the receiver is no longer separating channels, so the intermediate frequency filtering has failed or been misaligned. A failed audio stage would give silence. An open antenna would give weak reception of everything rather than strong reception of one thing. And excessive gain control would flatten levels without spreading a station across the dial. Reasoning from the symptom's pattern to the stage responsible is the practical skill.
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