The correct answer is "D".
desert terrain where the wind moves shallow dunes across rock

I should know because I am a amateur geologist.

Ok, so maybe I don't know, but if it is not the defining term for the shallow but wide sand piles over flat rocks that are found thoughout the World, then what is the term used to describe that wind blown effect?

I cheated and checked and the configuration is known as a "yarak".