All of the Following Factors Contributed to the End of Reconstruction

All of the following factors contributed to the end of Reconstruction EXCEPT

A) the Republican Party's new generation of political leadership proved even more radical than its predecessor,and sacrificed political support in favor of ideological purity.
B) Democrats used revelations of political corruption in Republican-dominated governments on the state and national levels to discredit the Republican Party.
C) the U.S.Supreme Court eviscerated many of the congressional protections established to protect blacks' rights,and strictly limited the application of the Reconstruction Amendments.
D) white supremacists' use of terrorist tactics made political participation too dangerous for large numbers of black southerners.