The ideology present in the proclamation of Wilhelm i is Nationalism. Nationalism involve the loving of ones person country and its culture.Person with nationalism ideology support one nation interest and his or her national identity to the exclusion of others.
I believe the answer is D. <span>It united many different European kingdoms under a shared religious culture.
When roman empire falls, the fragments of what used to be territories formed their own kingdom/Governance.
and even though the kingdoms/governance are now separated, they still held into their religious Christian traditions as some sort of guidance in their life</span>