Which best describes the outcome of the 1913 case Guinn v. U.S.?
A) The case represented a failure for the NAACP because it supported a law that limited the voting rights of formerly enslaved individuals.
B) The case represented a failure for the NAACP because it overturned a law that guaranteed equal voting rights for all Americans.
C) The case was a victory for the NAACP because it overturned a law that would have limited African American voting rights.
D) The case was a victory for the NAACP because it supported an existing law that upheld African American voting rights.