Identify a key causal factor of conflicts within Eastern Europe associated with the Cold War. (which option is correct)

the revolutions of 1989 across Eastern Europe

the dueling spheres of influence of the U.S. and the U.S.S.R.

the Yugoslav wars, beginning in 1991

a divided Berlin

1 answer

the dueling spheres of influence of the U.S. and the U.S.S.R.