D) the "White Primary"
The court case between Primus E. King, a religious leader and a barber in Columbus, Georgia, and J. E. Chapman Jr. the chair of the Muscogee County Democratic Party started in 1946.
Primus E. King, an African-American registered voter, had gone to the Muscogee County Courthouse in Columbus to cast his vote on July 4, 1944, in the then-Democratic Party’s primary election, however, he was asked to leave by law enforcement.
Fortunately for Primus E. King, a local physician who co-founded the local branch of the NAACP, encouraged and financially backed Mr. King in his lawsuit filed in federal court, styled "King v. Chapman." Mr. Primus E. King was favored by the United States District Court for the Middle District of Georgia, the court concluded that the exclusion of black voters was unconstitutional under the Fourteenth, Fifteenth and Seventeenth Amendments, and the U.S. Supreme Court refused to hear the appeal by J. E. Chapman Jr, which ended the State of Georgia's "whites only" primaries.