Answer:
Option C.
Step-by-step explanation:
Invasion by the Moroccans, is the right answer.
Sundiata Keita established the Mali Empire in or around 1235 by uniting the tribes of the Malinke peoples. The emperor of the kingdom was known as Mansa. Mansa Musa was one of the popular rulers of the Mali Empire. After his death, the empire began to fall and this condition was sped up by the invasion of the Moroccans.