The correct answer D) Southern Christian Liberty Conference.
The organization that also belongs to this diagram is Southern Christian Liberty Conference.
The Southern Christian Liberty Conference (SCLC) has its origins in the Montgomery Bus Boycott of December 1965. A black woman named Rosa Parks was arrested for refusing to give up her seat to a white passenger. His first president was Martin Luther King Jr. The SCLC was an important civil organization of the time and helped organized the March on Washington.