The office of the UN General Assembly is in :

Vienna
Paris
New York
Zurich

The correct answer is C. New York.

The United Nations General Assembly (UNGA) is one of the six principal organs of the United Nations. It is the main deliberative, policymaking, and representative organ of the organization. The UNGA is composed of all 193 Member States of the United Nations.

The UNGA meets in regular sessions every year from September to December. Special sessions may be convened by the General Assembly or by the Security Council. Emergency special sessions may be convened by a majority of the members of the General Assembly or by the Security Council on the request of any Member of the United Nations.

The UNGA is responsible for discussing and making recommendations on any matter within the scope of the Charter of the United Nations. It also has the power to initiate studies and make recommendations to promote international cooperation in the political, economic, social, cultural, educational, and health fields.

The UNGA elects the non-permanent members of the Security Council, the members of the Economic and Social Council, and the members of the Trusteeship Council. It also elects the Secretary-General of the United Nations.

The UNGA has the power to suspend or expel a Member State from the United Nations. It also has the power to recommend to the Security Council the appointment of a person to be the International Court of Justice.

The UNGA is the only organ of the United Nations in which all Member States have equal representation. It is therefore the most representative organ of the United Nations.

The UNGA is located in New York City, United States.