Correct Answer: (c) Atal Bihari Vajpayee
Solution:Atal Bihari Vajpayee is the first Indian to deliver a speech in Hindi at United Nations Assembly. He delivered the speech on 4 October, 1977 as Foreign Minister. During the 69th opening ceremony of United Nations on 27th September, 2014, Prime Minister Narendra Modi delivered his speech in Hindi. By doing this, he became the second Prime Minister, and third Indian leader to do so. It is noteworthy that in the year 1988, P.V. Narasimha Rao (the then Foreign Minister) addressed the United Nations session in Hindi.