Driving with reduced speed, with or without reason, does not determine the pollution of the ambient environment in any situation, but if driving with high engine speeds at low speeds, the consumption will increase and, implicitly, the pollution.
Incomplete and faulty combustion of the fuel will make the exhaust gases contain more residues and determines the pollution of the ambient environment by motor vehicles.
The malfunction of the petrol or diesel filter, more precisely its clogging, will make the supply system no longer carry the fuel to the engine, in which case the engine will no longer function, but will not determine the pollution of the environment.
The correct answer is: B
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