The correct answer is C.
Medgar Evers (1925 – 1963) was an activist who fought for equality rights during the Civil Rights Movement.
He fought to end segregation in the University of Mississipi and other public facilities, and to extend the opportunities of African Americans including, in the first place, ensuring voting rights for them.
He was murdered by a white supremacist, Byron De La Beckwith, who was also member of a local organization called White Citizens' Council, which fought against integration in schools and other facilities and, in general, against granting civil rights to African Americans.