In What Time Period Do Lustration Practices Find Their Process

In what time period do lustration practices find their process and policy origins in?

A) The Red Scare of the Cold War between the U.S. and U.S.S.R.
B) The de-nazification of Germany after the end of WWII
C) The American public's distrust of government officials during the Vietnam War
D) Eastern Europe's democratization after the Soviet Union's collapse