Discussion
Which process removes the trapped soot?
Answer: A
The soot is burnt rather than removed, and leaves as carbon dioxide. The last option explains exactly that, which makes it a correct and more instructive version of the same answer. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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