Correct answer: D. The driver only.
Where the passenger is over the age of 17 and travelling in a car it is their legal responsibility to comply with the child restraint regulations. Below that age, it is the drivers responsibility.
This is an official-style question from the Managing Risk 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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