Discussion
Which oxidant burns soot at a much lower temperature?
Answer: C
Nitrogen dioxide oxidises soot from around two hundred and fifty degrees. The last option explains exactly where it comes from, which makes it a correct and more detailed version. It underpins passive regeneration. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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