Final answer:
The Songhai Empire replaced Ghana as the most powerful empire in West Africa and became one of the largest empires in African history.
Step-by-step explanation:
The Songhai Empire replaced Ghana as the most powerful empire in West Africa.
The empire of the Songhay people took in the territories that had been controlled by Ghana and Mali and extended them east and north to become one of the largest empires in African history. The Songhay warriors took control of important cities like Timbuktu and Jenna, and their military success was based on armies of mounted horsemen.
Therefore, option A is the correct answer: It replaced Ghana as the most powerful empire in West Africa.