Which diagram best represents an important part of eastern European history?
A. World War II begins. Eastern Europe suffers serious damage.
B. World War I begins. Kosovo breaks away from Serbia.
C. Serbia attacks the Austro-Hungarian Empire. The Cold War begins.
D. The Soviet Union collapses. Communism spreads in eastern Europe. ​

Which diagram best represents an important part of eastern European history A World War II begins Eastern Europe suffers serious damage B World War I begins Kos class=