What were the three most powerful empires in west africa between the 400s and 1500s?

The three most powerful empires in West Africa between the 400s and 1500s are the following:

The Ghana Empire which lasted as the most powerful empire in West Africa between 400AD  to 1076AD was dependent on the Gold-Salt trade between the empire and North Africa or Mediterranean traders. The people of the empire are called Soninke, and their ruler is called ghana.

The Mali Empire lasted as the most powerful in the West African region between 1235 and 1353. The empire was also dependent on the gold trade, and was famous under rulers like Mansa Musa, and Sundiata.

The Songhai Empire which lasted as the most powerful empire in the West African region in the 1400s was famous under the likes of Sunni Ali, and Askia Muhammed. The Songhai Empire was later conquered by the Morrocan forces who used guns and gun powders to defeat the empire.

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i discarded the supernatant and kept the pellet in this part of the experiment because you have to return all unused chemicals into their original containers at the end of each labratory.

explanation:

the answer is a) to be able to obey them.