Concept:UNCTAD is a United Nations body created to promote the trade and development of poorer and developing countries.
Explanation:UNCTAD was formed to correct the unfair trade position of developing countries in world markets.
One of its chief functions is to assist less developed countries to export more and increase their share of world trade.
It encourages favourable policies, trade negotiations and special concessions to help these countries compete fairly with developed nations.
Technology transfer may occur in some UNCTAD programmes, but the central function reflected in the options is improving the participation of less developed countries in global trade.
Thus, the correct option is the one that states this exact role of UNCTAD.
Answer:B. increase share of less developed countries in world trade.