Discussion
Which temperature does soot require to burn in oxygen?
Answer: B
Oxygen burns soot only around six hundred degrees, which ordinary driving rarely reaches. The last option explains exactly that difficulty, which makes it a correct and more instructive version. Nitrogen dioxide works far lower. 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. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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