The correct option is B Jammu and Kashmir .
Census is conducted after every ten years since 1872 in India. The 1991 census of India was the 13th census among the series of census conducted. By March 1, 1991 the total counted population of India was at 843.931 million. No census was conducted in the state of Jammu & Kashmir in 1991 due to the disturbed conditions prevailing there. Option B is correct answer.