Which international organization was established after WWII to maintain peace and security?

• A. The World Bank
• B. The United Nations
• C. NATO
• D. The League of Nations

Answer: (B)

After World War II, there was a concerted effort to create a durable framework for preventing conflict and protecting international security. This led to the formation of the United Nations in 1945, established to provide a global platform for diplomacy, peacekeeping, and collective security through the UN Charter. The timing and mission match the prompt: an organization created after the war specifically to maintain peace and security around the world. Other options serve different purposes or arose in other contexts—The World Bank focuses on reconstruction and development, NATO is a Cold War-era military alliance for defense, and the League of Nations predated World War II and ultimately failed to prevent it. So the United Nations is the organization that fits the description.