The correct option is C Belgium
European Union (EU) is comprised of 28 nations with its headquarter located in Brussels, Belgium. EU was created by Maastricht Treaty which came into force on 1st November 1993. The treaty was aimed at improving political, economic integration of European countries by creating a single currency Euro, common foreign and security policy. EU was awarded Nobel Prize for peace in 2012 for its efforts to promote peace and democracy in Europe.