The correct option is D 1984
In June 1984, the Government of India carried out ‘Operation Bluestar’, the code name for army action against the Sikh militants in the Golden Temple. The Government successfully flushed them out, but it damaged the historic temple. This deeply hurt the Sikh sentiments. In revenge, on 31 October 1984, Prime Minister Indira Gandhi was assassinated outside her residence by her Sikh bodyguards.