A. A
A. A
B. B
C. C
D. D
When you start looking for signage you'll see that there's a lot of it, and the approach to roundabouts is one area where a number of signs warn drivers and instruct them what to do. In everyday driving we might not notice them because they eventually just seem like common sense, for example the blue arrow to keep left.
On some roundabouts in poorly lit areas, left-pointing chevrons might be used as further warning to drivers that they are approaching the roundabout.