The correct answer is D. 1991.
Rajiv Gandhi was the 6th Prime Minister of India, serving from 1984 to 1989. He was assassinated on May 21, 1991, by a suicide bomber belonging to the Liberation Tigers of Tamil Eelam (LTTE).
Gandhi was born in 1944 into the Nehru-Gandhi family, one of the most prominent political families in India. His father, Jawaharlal Nehru, was the first Prime Minister of India, and his mother, Indira Gandhi, was the third Prime Minister. Gandhi was educated at Cambridge University and the London School of Economics.
After returning to India, Gandhi worked as a pilot for Indian Airlines. In 1980, he entered politics and was elected to the Lok Sabha, the lower house of the Indian Parliament. In 1984, after the assassination of his mother, Gandhi was appointed Prime Minister.
As Prime Minister, Gandhi oversaw a period of economic liberalization in India. He also played a key role in the 1987 Indo-Sri Lankan Peace Accord, which ended the Sri Lankan Civil War.
Gandhi was assassinated on May 21, 1991, while campaigning for the Indian general election. He was 46 years old. His assassination was a major shock to India and the world.
The options A, B, and C are incorrect because Rajiv Gandhi was not assassinated in those years.