Assertion : CNG is better than diesel/petrol .

Reason : Unlike petrol or diesel , CNG burns more efficiently in the automobiles and very little of it is left unburnt .

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

The correct answer is Option (1)-Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

CNG is better than diesel because CNG burns most efficiently, unlike petrol or diesel, in the automobiles and very little of it is left unburnt. Moreover, CNG is cheaper than petrol or diesel, cannot be siphoned off by thieves and adulterated like petrol or diesel. The main problem with switching over to CNG is the difficulty of laying down pipelines to deliver CNG through distribution points/ pumps and ensuring uninterrupted supply.