How Did Corruption Impact American Government at the National Level

How did corruption impact American government at the national level during the Reconstruction Era?

A) Political scandal and corruption were common to both the Democratic and Republican parties.
B) Political corruption was usually restricted to the large cities that were controlled by Democratic political rings and was all but nonexistent at the state and federal levels of government.
C) Republicans in the South were associated with the greatest number of political scandals during the 1870s.
D) The Crédit Mobilier railroad scandal had little impact on the federal government and was restricted to corruption at the state level of government.