The correct option is B 1972
'Project Tiger' was started in 1972 due to decreasing number of tiger populations from 40,000 in 1900 to 1872 in 1972. The population increased to 4511 in 1989. However, it declined to 3750 in 1993. Tiger is conserved in Corbett national park in Nainital, Hazaribagh sanctuary in Bihar, Sunderbans in West Bengal, Ranthambore in Rajasthan, Bandipur national park in Mysore Karnataka.