What Was the Main Trigger to the Conflicts in the Balkans

Multiple Choice

What was the main trigger to the conflicts in the Balkans and the former Soviet Union according to many analysts?

A) ancient hatreds that modernization neutralized
B) the collapse of ethnic animosities
C) the collapse of Cold War constraints that had kept ethnic animosities under control
D) the disintegration of the Soviet Union
E) the disintegration of Yugoslavia