Discussion
Which visible sign indicates a lead is tracking to earth?
Answer: B
In darkness the leakage is visible as a blue flicker, and a carbon track marks the path. Carbon inside a boot genuinely indicates arcing at the plug connection, which makes the last option a real observation with a slightly different meaning. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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