Discussion
Which design change reduces crevice hydrocarbon emissions?
Answer: D
Raising the top ring shrinks the crevice volume directly. The last option explains exactly that mechanism, which makes it a correct and more instructive version. It also raises ring temperature, which limits how far it can go. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Checking which component actually carries the load settles most questions of this kind at once.
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