Discussion
Which deposit fouls a recirculation valve?
Answer: B
Soot alone is dry, but combined with oil mist it forms a tar that jams the valve. The last option explains exactly that mechanism, which makes it a correct and more instructive version of the same answer. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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