Correct Option: D

Chaudhary Charan Singh was the first politician to become a Chief Minister of a state and Prime Minister of India. He held the position of Chief Minister of a state (Uttar Pradesh: April 1967 – February 1968 and again in 1970) before becoming the Prime Minister of India in July 1979. Former Karnataka Chief Minister H.D. Deve Gowda was the first Chief Minister of a state (Karnataka) to be elevated to the post of Prime Minister of India while in office in 1996. India’s current Prime Minister Narendra Modi also became the Prime Minister while serving as the Chief Minister of Gujarat from October 2001 to May 2014.