The main goal of those who participated in freedom summer was to

register blacks to vote in the South.

Explanation:

Freedom Summer was a major civil rights campaign that started in mid-1964, with the objective to register as many blacks as possible to vote in the South, particularly in the state of Mississippi. Racial segregation in the South, especially through the Jim Crow laws, had barred black people from exercising their full civil rights, including the right to vote. Freedom Summer was launched as response to that, and many volunteers, black and white, joined the initiative. However, it wasn't well received by a large part of the white population, and activists were subject to harassment and violence from the authorities and the public alike. Because of this and resistance to change, Freedom Summer wasn't succesful in registering many blacks to vote, but it brought attention to the issue, and it was a major influence behind the Voting Rights Act of 1965, which finally granted universal suffrage in the United States, regardless of race.

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.

if it were me, i would pick c. c is the best answer because it's basically saying go on a non-violent strike for india