Discussion
Which soot formation step occurs first in a diesel spray?
Answer: B
Fuel in the rich core pyrolyses before it can find oxygen. The last option describes exactly that step, which makes it a correct and more detailed version of the same answer. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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