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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the french gave their support to another tribe during he war.

the correct answer is “opportunity cost”. opportunity cost is what a company misses out because it decided in one option over another one. in this case, the company decided to invest in building a factory so it gave up another possible benefit or profit in order to achieve success with the factory.  

trade-off is not the correct answer since it is a situation in which you accept losing something in return for benefits in other areas.

and finally, consequence is a general term used to accept what it comes when you make a decision. it can be a positive or negative consequence depending if the decision you took was the correct one.