Discussion
Which consequence follows from fitting too hot a plug?
Answer: B
A tip running too hot becomes a source of ignition before the spark arrives. Fouling is the consequence of too cold a plug, which makes the second option describe the opposite error accurately. The order in which the effects act is what decides the outcome, so it is worth establishing first. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Most errors here come from carrying a result across from a neighbouring case where it does not hold. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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