The correct answer is: D. The UN Security Council
The UN Security Council is one of the six principal organs of the United Nations. It is charged with the maintenance of international peace and security. The Security Council has 15 members, five of which are permanent members (China, France, Russia, the United Kingdom, and the United States) and 10 of which are elected by the General Assembly for two-year terms.
Angola, Malaysia, New Zealand, Spain, and Venezuela were elected as non-permanent members of the Security Council on 16 October 2014. They will serve on the Council from 1 January 2015 to 31 December 2016.
The UN General Assembly is the main deliberative organ of the United Nations. It is composed of all 193 Member States of the United Nations. The General Assembly meets in regular sessions every year from September to December. It also holds special sessions and emergency special sessions as needed.
The UN Trusteeship Council is one of the six principal organs of the United Nations. It was established in 1945 to oversee the administration of trust territories, which were territories that were not self-governing and were placed under the administration of a trusteeship agreement with the United Nations. The Trusteeship Council completed its work in 1994, when the last trust territory, Palau, became independent.
The UN Human Rights Council is an inter-governmental body within the United Nations system responsible for promoting and protecting human rights around the world. The Council was established in 2006 by the UN General Assembly to replace the UN Commission on Human Rights, which had been widely criticized for its lack of effectiveness. The Council is composed of 47 Member States, which are elected by the General Assembly for three-year terms.