The correct response is B: They were founded between 1890 and 1920.
Historically Black Colleges and Universities (HBCUs) were established primarily during this time period to provide higher education to African Americans, especially in the context of the Jim Crow laws and segregation. While some of the universities listed may have connections to Booker T. Washington or the Plessy v. Ferguson decision, not all HBCUs can be directly grouped under those specific criteria.