Correct answer: B. A door width.
When you are passing parked vehicles, you should leave at least a door's width of clearance in case somebody opens their car door unexpectedly, this will also increase visibility of pedestrians in the area.
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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