Why do you think Charlemagne succeeded in building such a vast empire in 4 sentences

Because Charlemagne spent much of his time at war. He led his armies into battle against many neighboring kingdoms and conquered them.  Explanation:Charlemagne  was a great admirer of education; as he built schools across Europe. He also brought scholars to teach in his capital at Aachen (AH-kuhn), now in western Germany. Among these scholars were some of the greatest religious scholars and teachers of the Middle Ages. Their teachings helped shape religious and social life in Europe for centuries.

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hello your answer is d

c or d. good luck !