Which of these contributed to the development of the civil rights movement during the 1920s and 1930s?

the great migration
plessey v. ferguson
the national origins act
the nineteenth amendment

I would say that Plessy v. Ferguson contributed to the Civil Rights movement. This was a court case that ruled that racial segregation in schools was allowed as long as the education for black students was equal to white students. Although this does not seem like a civil rights act, it later lead to Brown v. Board of Education, which ended racial segregation in schools all together.