Following the Civil War, poll taxes and literacy tests were methods used to discriminate against voters based on race. This is best represented by option C.
In the years following the Civil War, authoritarians implemented poll taxes and literacy tests as a way to target and section out black people. With these procedures in place, it was emphasized that black people could not vote. Discriminatory practices of such were referenced by the Jim Crow Laws in that educational and financial barriers hindered black prosperity. These practices collectively uplifted many forms of disenfranchisement, especially through deprivations of suffrage.