A photo shows a large crowd of African American and white people in 1960s-era clothing protesting closely together. People are holding signs with a variety of slogans calling for changes such as school integration, jobs, and an end to racial bias.

What method are the people in the photograph using to bring attention to a lack of social and economic opportunity?

A.
nonviolent protest

B.
affirmative action

C.
boycott

D.
grassroots referendum campaign