Concept:T. S. Tirumurti is an Indian diplomat who was appointed as India’s Permanent Representative to an international organisation.Explanation:T. S. Tirumurti was appointed as the next Permanent Representative of India to the United Nations in May 2020.He served in this position until 30 June 2022.He has since retired from service.Therefore, the correct option is the United Nations.Answer:United Nations (Option C)