Why do you think timbuktu became an important center of learning?

it became important because it taught new information in the school and they got a better education.

Explanation:

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.

the answer would be c