"In the presence of a growing national civil rights movement, President Lyndon Johnson issued a call for strong voting rights laws in 1965. The Voting Rights Act, signed into law in August 1965, suspended literacy tests and provided for the appointment of federal examiners with the power to register qualified citizens to vote. On being signed into law, the act had an almost immediate impact In South Carolina the number of American Americans registered to vote rose dramatically. In 1964, 38.7 percent of voting-age African Americans were registered. Four years later that number climbed to 50.8 percent. There were also gains in African American political participation. Less than a decade after the passage of the act, the number of African American legislators had risen to thirteen. from "The South Carolina Encyclopedia" Which of these BEST explains the actual impact of literacy tests in the South?

A) They limited the number of uneducated voters.

B) They limited the number of Democratic voters.

C) They limited the number of Republican voters.

D They Limited the number of African American voters,