Both C and D is what I think please tell me if I am wrong
Well, the only one that actually makes sense to me is C.
The concept of separation of powers is a way to divide power equally among the three government branches while not giving one branch too much power over the others.
Explanation:
This'll make it easy : https://www.bbc.co.uk/bitesize/topics/zqhyb9q/articles/zkb86v4