The Exodusters primarily left the South due to B) Discrimination. They faced severe racial discrimination, violence, and limited rights in the South following the Civil War. The Exoduster movement involved African Americans migrating to Kansas and other states in search of better opportunities, safety, and an escape from the oppressive conditions that characterized life in the South during that period.
While land grants and educational opportunities may have been factors in their migration, the primary motivation was escaping the pervasive discrimination and seeking a better life.