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Among the following motor-vehicle fuels, the LEAST polluting is generally considered to be:
ACoal
BPetrol
CDiesel
DCompressed Natural Gas (CNG)
Answer & Solution
Correct answer: D. Compressed Natural Gas (CNG)
CNG burns more completely than petrol or diesel and produces fewer particulates and harmful gases, which is why many Indian cities have shifted public transport to CNG. Coal is the most polluting (high CO₂ + particulates) and is no longer used in road vehicles.
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