Final answer:
The author includes the section "Southern Christian Leadership Conference (SCLC)" to describe one of the civil rights organizations that was a leader in the civil rights movement.
Step-by-step explanation:
The MAIN reason the author includes the section "Southern Christian Leadership Conference (SCLC)" is (C) to describe one of the civil rights organizations that was a leader in the civil rights movement.
The SCLC, formed by Martin Luther King Jr. in 1957, was an organization led by black ministers who supported the civil rights movement. They provided institutional support to the movement through the participation of ministers and churches, and many civil rights meetings were held in black churches throughout the nation.
This section helps to emphasize the importance and influence of the SCLC in the civil rights movement.