Which government agency analyzed data to ensure African-Americans were receiving fair treatment at the polls?

The correct answer is C. Voting Rights Department.

The Voting Rights Department, part of the U.S. Department of Justice, was established to enforce and protect the voting rights of all citizens, particularly focusing on ensuring that African-Americans and other minority groups receive fair treatment at the polls. This agency analyzes data related to voting practices and addresses any instances of discrimination in the electoral process.