Answer:
I'd say D
Explanation:
B is wrong (clearly), C is to... straight foward.... and A is a possibility but I believe its D.
C is the complex sentence because it contains the word while and an independent and dependent clause! :)
They are all right except the first one. All I know is that the first one isn't cavaliers.
D. it is pretty simple and is to easy or high sxchool
