Correct answer: A. All year round.
The purpose of coolant is to keep the engine cool during operation. Coolant is usually a mixture of water and anti-freeze : this ensures that the engine is kept cool and that the coolant does not freeze in very cold weather.
This is an official-style question from the Technical Matters 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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