Discussion
Which noise indicates a failing flap motor?
Answer: A
A motor hunting against a jammed flap clicks rhythmically. The last option explains exactly that mechanism, which makes it a correct and more instructive version of the same answer. 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. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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