Discussion
Which emission does direct injection increase?
Answer: C
Locally rich regions in a stratified charge produce soot, so petrol particulate filters are now fitted. Nitrogen oxides genuinely are a challenge for lean burn direct injection, which makes the last option a real emissions problem of the same technology. Checking which component actually carries the load settles most questions of this kind at once. Naming what changes and what stays the same is the reliable route through questions of this shape. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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