Discussion
What problem does local oscillator tracking address?
Answer: D
As the receiver is tuned, the oscillator must stay a fixed intermediate frequency away from the signal, which a single ganged capacitor cannot do exactly because the required frequency ratio differs from the signal circuit's. Padder and trimmer capacitors correct it at three points across the band. Drift is a stability matter handled by component choice. Antenna matching and audio levelling are separate functions. Tracking is a geometric problem peculiar to ganged tuning.
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