Earlier, leaded petrol used to be the most widespread, through easily preventable, source of urban air pollution in the world. According to WHO (World Health Organisation). 15-18 million children in the developing countries are already suffering from permanent brain damage due to lead poisoning. Why is tetra-ethyl lead added to petrol?

Earlier, leaded petrol used to be the most widespread, through easily

1.	Earlier, leaded petrol used to be the most widespread, through easily preventable, source of urban air pollution in the world. According to WHO (World Health Organisation). 15-18 million children in the developing countries are already suffering from permanent brain damage due to lead poisoning. Why is tetra-ethyl lead added to petrol?
A.	It prevents engine knocking
B.	Reduces vehicular emissions
C.	Increase life of motor tyres
D.	None of the above
Answer» B. Reduces vehicular emissions