How did the redrawing of district lines in Oklahoma in the late 1960s contribute to the greater voter representation of African Americans?
A. It segregated African American and white voters' polls and voting districts.
B. It allowed African Americans more of a chance to vote for their own representatives.
C. It required all African American residents to vote in elections until 1980.
D. It encouraged African American migrants to return to the state to be able to vote.