The correct answer is: D. Two.
The UN General Assembly elects a President and 21 Vice Presidents at the start of its each regular session. The President and Vice Presidents are elected by a majority vote of the members present and voting. The President serves for a one-year term and the Vice Presidents serve for a two-year term.
The President of the General Assembly is responsible for presiding over the sessions of the Assembly and for ensuring that the rules of procedure are observed. The Vice Presidents assist the President in carrying out these duties.
The President and Vice Presidents are elected from among the members of the General Assembly. They are elected on the basis of equitable geographical distribution.