which of the following changes to western Europe during the period 400-1450 occurred under too reign of Charlemagne?

A. A blend of Germanic and eastern Orthodox Christianity emerged.
B.The Christian Church became less entrenched as the main religion Western Europe
C.A new model of civilization emerged in western Europe for the first time since the fall of Rome.
D. Charlemagne's defense against Viking invaders helped to consolidate secular rule in Western Europe.