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.