The Dramatic Rise in Political Corruption in the Post-Civil War

The dramatic rise in political corruption in the post-Civil War era was triggered by​

A) ​the expansion of government contracts and bureaucracy that created new opportunities for abuse.
B) ​relaxed standards and rules after years of wartime hardship.
C) ​rapid postwar economic growth.
D) ​the emergence of get-rich-quick schemes.
E) ​all of these choices.