Final answer:
Mansa Musa's rule of Mali led to the establishment of Timbuktu as a center of learning and trade, with the creation of libraries and schools. The option (A) is correct.
Step-by-step explanation:
During Mansa Musa's reign, Timbuktu became a center of international trade and education. The king brought Arab scholars to the city, as well as architects, astronomers, poets, lawyers, mathematicians, and theologians.
Over one hundred schools and eighteen universities were established (for men only, of course) for Islamic studies. He attracted Arab scholars to the city and built numerous educational institutions for Islamic studies. Therefore, option (A) is correct.