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.