What does this sign mean?

1. A.Mini-roundabout ahead.
2. B.Dual carriageway ahead.
3. C.Start of central reserve or obstruction.
4. D.Heavy vehicles have priority.

This is an official-style question from the Legal Matters & Rules of the Road 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.