The correct option is D 54
The UN Economic and Social Council has 54 members in total elected by the General Assembly. The General Assembly originally elected 18 members of the Council. However, the charter was amended twice to increase ECOSOC membership first to 27 in 1965 and finally on 1974 to 54 current members. Each member has to serve for a duration of 3 years. Every year one third of the members are newly chosen.