Answer:
C) much of Western Europe was United under a single ruler
Step-by-step explanation:
Charmalagne began his campaign to obtain new territories for his new kingdom in the late 700s.
His conquests were successful. As soon as he defeat foreign territories, he transform them into one of their own and placed the Men he trust to take care of the new territories. In early 800s, he managed to unite the majority of western and central Europe under his rule, put it under the a new banner, which later on called the Holy Roman Empire.