Discussion
Which test confirms a lamp holder is making good contact?
Answer: B
Measuring the drop from the supply to the bulb contact under load exposes a corroded holder. Bulb substitution genuinely is the first step in most cases, which makes the last option a real and sensible technique. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. 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.
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