The correct answer is: B. Lal Bahadur Shastri.
Lal Bahadur Shastri was the first Indian to make a speech in Hindi before the UN General Assembly. He did so on September 22, 1965, during the Indo-Pakistani War of 1965. In his speech, Shastri called for peace and understanding between India and Pakistan. He also spoke about the importance of the United Nations in resolving international disputes.
A. B. Vajpayee, Lal Krishna Advani, and Morarji Desai were all Indian prime ministers who spoke at the UN General Assembly, but they did not do so in Hindi. Vajpayee spoke in English in 1977, 1984, and 1998. Advani spoke in English in 1998 and 2002. Desai spoke in English in 1977.
Lal Bahadur Shastri was born on October 2, 1904, in Mughalsarai, Uttar Pradesh, India. He was the son of a school headmaster. Shastri studied at Kashi Vidyapeeth and Allahabad University. He joined the Indian National Congress in 1921 and became a close associate of Mahatma Gandhi. Shastri served in the Indian government in various capacities, including Minister of Railways, Minister of Commerce and Industry, and Minister of External Affairs. He was elected Prime Minister of India in 1964. Shastri died on January 11, 1966, at Tashkent, Uzbekistan, while attending a summit meeting with Pakistani President Ayub Khan.