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.

It's a, I did the test, the person above is wrong

Explanation:

i would say d out of common sense

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