Which of the following sentences from the article would be MOST important to include in a summary of the article?

A
In January 1957, Martin Luther King Jr. and more than 60 ministers and civil rights activists founded the Southern Christian Leadership Conference (SCLC) to coordinate their civil rights efforts.

B
From his jail cell in Birmingham, King eloquently spelled out his theory of nonviolence: Nonviolent action seeks to create a crisis, so that a community is forced to confront the issue and deal with it.

C
All over the country people began questioning the South's segregation (or "Jim Crow" laws) and the discriminatory treatment of African-American citizens.

D
By 1968, King was becoming discouraged at the slow progress of civil rights in America and began to take up other causes as well.

A.

In January 1957, Martin Luther King Jr. and more than 60 ministers and civil rights activists founded the Southern Christian Leadership Conference (SCLC) to coordinate their civil rights efforts.