All of these.
The Southern Christian Leadership Conference (SCLC) was formed in 1957. Martin Luther King, Jr., was president of the organization from its founding untill his assassination in 1968. The fact that it included the name "Christian" in its title tells you that a large measure of the support and organization for the group came through the Christian churches of the black community. The SCLC was devoted to promoting civil rights, including getting black persons registered to vote, and stayed committed to using non-violent methods.
