Correct answer: C. By increasing carbon monoxide levels.
Carbon monoxide is a poisonous gas emitted by vehicle exhausts into the atmosphere. Driving economically and keeping a vehicle well maintained can reduce the level of carbon monoxide emissions.
This is an official-style question from the Safe and Responsible Driving topic of the Ireland driver theory test (Cat. B). Practise all 807 questions free on iTest.ie — with timed mock exams, automatic mistake tracking and progress sync across devices.
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