What Event in the 1980s Led to the Military Dictators

What event in the 1980s led to the military dictators giving way to a civil rule in Argentina?

A) The establishment of the South American Community of Nations (CSN) .
B) The bankruptcy of Argentina by the policies of Peronismo.
C) The end of the Good Neighbor Policy with the U.S.
D) The Argentines lost the Falkland Islands War in 1982.
E) The election of Ronald Reagan in the U.S.in 1980.