Answer: A. the establishment of a communist bloc in Eastern Europe
After the end of the Second World War, much of Europe was devastated in all aspects and the affected countries saw their economies weakened.
However, the United States and the former Soviet Union still enjoyed great economic and industrial power, but they had different and completely opposed ideologies, such as capitalism and communism.
Therefore, as the United States controlled the western block of the continent with capitalism and the Soviet Union the Eastern block with communism, this brought the division of Germany with the construction of the Berlin Wall and the beginning of the Cold War, where both ideologies competed to show which was the best.