What led to the communist guerilla forces being defeated during the Greek Civil War?

A.) depleting reserves of the Greek government

B.) support from non-communist neighboring countries

C.) a military attack by Soviet armed forces

D.) an intervention by the United Nations

The Greek Civil War happened during 1946 to 1949 in Greece, which was a war between the army of Greek government and Democratic Army of Greece. The Communist Guerilla forces lost during the Greek Civil War and the main reason is the depletion of reserves of the Greek government.