The correct option is C North Atlantic Treaty Organisation (NATO)
The North Atlantic Treaty Organization also called the North Atlantic Alliance, is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on 4 April 1949. NATO constitutes 28 member states across North America and Europe. The Partnership for Peace (PfP) is a programme of practical bilateral cooperation between individual Euro-Atlantic partner countries and NATO. It allows partners to build up an individual relationship with NATO, choosing their own priorities for cooperation.