Based on the organization's mission and vision, the cooperative efforts of the United Nations are PRIMARILY dedicated to international peacekeeping.
United Nations is famous for being an intergovernmental organization whose purpose is to maintain international peace and security, along with different world nations.
United Nations typically promotes friendly relations among different countries, international cooperation, and harmonizes various countries.
Hence, in this case, it is concluded that the correct answer is option E. "international peacekeeping."
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