I would say B, I'm not fully sure.
I think your missing something that goes with the question?
They all stopped liking Eachother
Answer:
btfyufucyigbuf yvo7tf7ygiyofvi vuigv
Explanation:
gvuivigvyuf ogvuig ug ykyg ivhjygkh yvjgyj
A system in which states agree to form a national government, but maintain their sovereignty