summary of the most important events and court cases of the African American struggle for civil rights.

The movement has its origins in the Reconstruction era during the late 19th century, although the movement achieved its largest legislative gains in the mid-1960s after years of direct actions and grassroots protests. The social movement's major nonviolent resistance and civil disobedience campaigns eventually secured new protections in federal law for the human rights of all Americans.

(shorter version) :

The civil rights movement in the United States was a decades-long struggle by African Americans and their like-minded allies to end institutionalized racial discrimination, disenfranchisement and racial segregation in the United States.

the real answer is b