The correct answer is D) an invasion from Morocco.
The event that marked the final stage in the collapse of the Songhai empire was an invasion from Morocco.
The Songhai Empire was a prominent empire from 1464 to 1591. They lived in Western Africa, south the Sahara Desert. Its capital city was Gao, located on what today is Mali. In the mid-1500s, the empire started to weaken due to internal conflicts that derived in a civil war. But in 1591, the empire was invaded by the Moroccan troops and captured the capital city of Gao and another important one, Timbuktu.
