What did freedom summer try to accomplish?

The Freedom Summer tried to accomplish the registration of black voters.

Explanation:

The Freedom Summer was one of the milestones of the Civil Rights Movement in the United States. This was a campaign carried out in the summer of 1964 on the initiative of the SNCC and the Council of Federated Organizations in the state of Mississippi to get as many blacks as possible on the voting polls, as at the time the percentage of black voters registered in Mississippi was only 6.7%, being the lowest of all the southern states.

your answer would be (a)

by improved communication.