Identify an accurate statement about vote suppression in the history of american politics. a. the poll tax limited voting to those whose ancestors could vote after the civil war. b. the grandfather clause was a technique used to disenfranchise black voters. c. literary tests were tactics used by the state to encourage african americans to vote. d. the white primary law prevented whites from voting in democratic primary elections. e. the fifteenth amendment explicitly denied african americans the right to vote.