Concept:Identify the current Secretary-General of the United Nations from the given options.Explanation:Antonio Guterres is the Secretary-General of the United Nations as of 2019.He is a Portuguese politician and diplomat.He assumed office on January 1, 2017.He succeeded Ban Ki-moon as the ninth Secretary-General.Previously, he served as the United Nations High Commissioner for Refugees from 2005 to 2015.Answer:D. Antonio Guterres