Who ever answers this first ill give them brainliest

Which of the following was a key accomplishment of the people of songhai? a. they had a strong military and became the largest empire in west africa. b. they established a center of islamic scholarship. c. they worked with iron and prospered from the gold-salt trade. d. they dominated in the trade of ivory, enslaved people, and animal skins.

How did dynasties end and how did new ones start?

Astudent receives a pell grant based on the_.a. satb. nasac. fafsad. act