Which of the following statements is true?

Whenever a United Nations peacekeeping force has been deployed to a conflict zone it has resulted in a decrease in violence on the ground.
Like the League of Nations, the United Nations was only concerned with maintaining peace around the world.
Unlike the League of Nations, the United Nations was able to deploy a peacekeeping force and implement proper economic sanctions
The United Nations was unsuccessful in preventing conflict during the Cold War

The statement "The United Nations was unsuccessful in preventing conflict during the Cold War" is true.