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New petrol-engined cars must be fitted with catalytic converters. The reason for this is to

A reduce harmful exhaust emissions
Explaination
We should all be concerned about the effect traffic has on our environment. Fumes from vehicles are polluting the air around us. Catalytic converters act like a filter, removing some of the toxic waste from exhaust gases.
B control exhaust noise levels
C prolong the life of the exhaust system
D allow the exhaust system to be recycled