What is the name of the international organization that aims to promote peace and security among countries?

The correct choice is the United Nations (UN), which is an international organization established in 1945 with the primary goal of promoting peace, security, and cooperation among countries. The UN serves as a platform for dialogue, negotiation, and diplomacy, facilitating diplomatic efforts to resolve conflicts and prevent wars. It also engages in various initiatives aimed at addressing global issues such as poverty, human rights, and environmental degradation.

While organizations like NATO (North Atlantic Treaty Organization) focus on military alliances and collective security primarily among its member countries, the UN encompasses a broader mandate and is universally recognized for its peacekeeping efforts. The European Union (EU) is primarily an economic and political union of European countries aimed at promoting economic cooperation and integration. ASEAN (Association of Southeast Asian Nations) focuses on regional cooperation in Southeast Asia, with an emphasis on economic growth and social progress, but it does not have the same global mandate for peace and security as the UN. Thus, the UN stands out as the primary organization dedicated to promoting worldwide peace and security among nations.