Correct answer: D. To reduce harmful exhaust emissions.
Catalytic converters are part of a vehicle’s exhaust system. They help to protect the environment by removing up to 75% of the carbon monoxide, nitrogen oxide and hydrocarbons from the vehicle’s exhaust.
This is an official-style question from the Safe and Responsible Driving topic of the Ireland driver theory test (Cat. B). Practise all 804 questions free on iTest.ie — with timed mock exams, automatic mistake tracking and progress sync across devices.
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