The correct answer is C. 1963, Jawaharlal Nehru.
Bhakra Dam is a concrete gravity dam on the Sutlej River in Bilaspur district of Himachal Pradesh, India. It was constructed between 1953 and 1963, and was dedicated to the nation on 22 November 1963 by the first Prime Minister of India, Jawaharlal Nehru. The dam is one of the largest dams in the world, and is a major source of hydroelectric power for India. It also provides irrigation for over 1 million hectares of land, and helps to control floods in the Sutlej River basin.
Option A is incorrect because Rajiv Gandhi was the Prime Minister of India from 1984 to 1989. Bhakra Dam was dedicated to the nation in 1963, before Rajiv Gandhi became Prime Minister.
Option B is incorrect because Indira Gandhi was the Prime Minister of India from 1966 to 1977 and again from 1980 to 1984. Bhakra Dam was dedicated to the nation in 1963, before Indira Gandhi became Prime Minister for the first time.
Option D is incorrect because Lal Bahadur Shastri was the Prime Minister of India from 1964 to 1966. Bhakra Dam was dedicated to the nation in 1963, before Lal Bahadur Shastri became Prime Minister.