Discussion
Which pollutants does a modern petrol standard limit?
Answer: D
Modern petrol standards cover the gases and, for direct injection, particulates. The last option states that scope precisely, which makes it a correct and more detailed version. Carbon dioxide is regulated separately. 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. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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