Question

the formation of the united nations was a response to
the post - war desire for international cooperation.
the truman doctrine, which tried to contain communism
the creation of the marshall plan to help rebuild europe
the formation of the defense organization nato

Explanation:

The United Nations was established in 1945 mainly due to the post - war world's strong desire for international cooperation to prevent future large - scale wars and promote global peace and development. The Truman Doctrine, Marshall Plan, and NATO formation were related to the Cold - War context rather than the main reason for the UN's formation.

Answer:

the post - war desire for international cooperation.