Discussion
Which three sources of emissions does a petrol vehicle have?
Answer: A
The three traditional sources are the tailpipe, the fuel system and the crankcase. The last option describes each of them, which makes it a correct and more detailed version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The order in which the effects act is what decides the outcome, so it is worth establishing first. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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