(A) North Atlantic Treaty Organization
(B) World Health Organization
(C) United Nations
(D) World Bank
🧠 Explanation:
In 1949, the North Atlantic Treaty Organization (NATO) was formed as a military and political alliance to ensure collective defense among its member states. The founding members included the United States, Canada, the United Kingdom, France, and several other Western European countries. The alliance emerged in the context of post–World War II tensions and the beginning of the Cold War, aiming to counter potential aggression from the Soviet Union and promote stability in the North Atlantic region. NATO’s guiding principle, outlined in Article 5, states that an attack on one member is considered an attack on all, ensuring mutual protection.