How did the German part of Charlemagne's kingdom change under the rule of Otto the Great?

A.
It was divided by several German dukes.

B.
It fell under the rule of the Byzantine empire.

C.
It was invaded by Anglo-Saxons.

D.
It was united as one

D. It was united as one. Under the rule of Otto the Great, the German part of Charlemagne's kingdom experienced a period of stability and growth. Otto successfully united the various German duchies under his rule, establishing the Holy Roman Empire and beginning a period of centralized government and economic prosperity.