Which of the Following Developments Helped Propel the Civil Rights

Which of the following developments helped propel the civil rights movement in the 1950s and early 1960s?

A) The unanimous holding in Brown v. Board of Education (1954) that segregation in public schools was unconstitutional.
B) The federal government forcefully ensuring the integration of Little Rock's Central High School, despite the determined opposition of Arkansas governor Orval Faubus and his segregationist supporters.
C) The "sit-in" movement of young African Americans which sought to compel equal treatment of blacks and whites in restaurants, transportation, employment, housing, and voter registration.
D) The formation of the Southern Christian Leadership Conference (SCLC) by the Rev. Martin Luther King, Jr. to mobilize black churches on behalf of black civil rights.
E) The enthusiastic endorsement of President Eisenhower of the enactment of a strong Civil Rights bill.