题目内容：
Who are the first to make the successof sit-in become true?回答下面的题目American Blacks experienced a revolutionafter 1945, a revolution in expectations．Following World War Ⅱ , the steady movement toward first-classcitizenship for Black people quickened, with significantactions taking place in courts of law, in voting booths, in restaurants and inthe streets of the nation．A decade of intense civil rights activity was launched in 1954 when theUnited States Supreme Court declared segregated schools to beunconstitutional． In 1955, Dr． Martin Luther King, Jr． , effectivelyorganized the Blacks of Atlanta, Georgia, in a bus boycott． The boycott lastedtwo years, and when it was over, Blacks no longer were degraded by being forcedto sit or stand in the rear of buses．In 1960, a group of Black college students decided that they, as well aswhite persons, had the right to eat at a lunch counter in Greensboro, NorthCarolinA． This sit-in sparked anaggressive national movement and, in the next few years, thousands of young menand women--Black and White, North and South--overturned local laws and customsthat had maintained segregation． Sit-ins, pray-ins, freedom rides, freedommarches and demonstrations to open all schools to Black children took placeacross the nation．Several important actions took place tochange the status of black people A．Black college students and whites．
B．First-class citizens．
C．The Blacks of AtlantA．
D．Young men and women in Greensboro．
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