Which one of the following Articles of United Nations Charter is related to the procedure of voting ?

Article 18 of the UN Charter, under the heading "Voting" in Chapter IV, provides that each member of the General Assembly has one vote and that decisions on important questions need "a two-thirds majority of the members present and voting".

Article 10 sets out the Assembly's general functions and Article 16 its trusteeship functions. Voting in the Security Council is governed by Article 27, which is not among the options.