The correct answer is option 1: tension between East and West. The Cold War refers to the political and military tension that existed between the United States and its Western allies (The East) and the Soviet Union and its Eastern Bloc allies (The West) from the end of World War II until the early 1990s.

Option 2 is partially correct as it captures the ideological rivalry between the capitalist and communist worlds, which was a key aspect of the Cold War. However, it does not encompass the full scope of the conflict.

Option 3 is also partially correct as there was indeed tension between the superpowers, specifically the United States and the Soviet Union, during the Cold War. However, it does not cover the broader East-West divide.

Option 4 is the most comprehensive answer as it includes all the elements mentioned in the previous options. It acknowledges the tension between East and West, the ideological rivalry between capitalist and communist ideologies, and the tension between the superpowers.