What does this sign mean?

1. A.Road narrows from right.
2. B.Slippery road ahead.
3. C.Steep hill ahead.
4. D.Series of bends ahead.

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 804 questions free on iTest.ie — with timed mock exams, automatic mistake tracking and progress sync across devices.