The answer is D. Rajiv Gandhi.
The other four options are all former presidents of India. Rajiv Gandhi was the prime minister of India from 1984 to 1989. He was the son of Indira Gandhi, who was also prime minister of India. Rajiv Gandhi was assassinated in 1991.
Zail Singh was the seventh president of India, serving from 1982 to 1987. He was the first Sikh to hold the office of president.
VV Giri was the sixth president of India, serving from 1969 to 1974. He was the first Indian to be elected president by an electoral college consisting of members of both houses of parliament and the legislative assemblies of the states.
Zakir Hussain was the fourth president of India, serving from 1967 to 1969. He was the first Muslim to hold the office of president.
Dr. Rajendra Prasad was the first president of India, serving from 1950 to 1962. He was a leading figure in the Indian independence movement and a close associate of Mahatma Gandhi.