Discussion
Which condition produces nitrogen oxides?
Answer: B
Nitrogen and oxygen combine only at high temperature, which is why lean and hot conditions produce the most. The last option gives exactly that threshold, which makes it a correct and more specific version. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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