The correct answer is D. Washington.
The North Atlantic Treaty Organization (NATO) is an intergovernmental military alliance between 30 North American and European countries. The organization implements the North Atlantic Treaty that was signed on 4 April 1949.
The treaty was signed in Washington, D.C., by the 12 founding members of NATO: Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom, and the United States.
The treaty was created in response to the threat of the Soviet Union and its allies in Eastern Europe. The treaty’s main purpose is to provide collective security for its members against any threat of aggression.
NATO has played a major role in the Cold War and in the post-Cold War era. The organization has been involved in a number of military operations, including the War in Afghanistan and the intervention in Libya.
NATO is a major player in international security and is considered to be one of the most powerful military alliances in the world.