The main purpose of the Group of 77 was

sustained economic growth
to promote African unity and solidarity
to defend the economic and trade interests of the developing nations of the world
None of the above

The correct answer is C. to defend the economic and trade interests of the developing nations of the world.

The Group of 77 (G77) is a coalition of developing nations that was established on June 15, 1964, by 77 countries at the United Nations Conference on Trade and Development (UNCTAD) in Geneva. The G77’s main purpose is to promote the interests of developing countries and to negotiate with developed countries on issues such as trade, finance, and development.

The G77 has grown to include 134 member states, and it is one of the largest and most influential groups of countries in the United Nations. The G77 has played a major role in shaping the international economic order, and it continues to be a powerful voice for the developing world.

Option A is incorrect because the G77’s main purpose is not to promote sustained economic growth. The G77 does support economic growth, but this is not its primary focus.

Option B is incorrect because the G77’s main purpose is not to promote African unity and solidarity. The G77 does include many African countries, but it is not an organization that is specifically focused on Africa.

Option D is incorrect because the G77 is a real organization with a real purpose.