The correct option is B An integral part of the United Nations
The Group of Twenty (G20) is the premier forum for its members’ international economic cooperation and decision-making. Its membership comprises 19 countries plus the European Union. The G20 is supported by international organisations, including the Financial Stability Board, the International Labour Organisation, the International Monetary Fund, the Organisation for Economic Co-operation and Development, the United Nations, the World Bank and the World Trade Organization.