Answer : 2. "सिंधी"
Explanation :

The Jnanpith Award is an Indian literary award presented annually by the Bharatiya Jnanpith. 

It is awarded to an author for their "outstanding contribution towards literature" Instituted in 1961, The award is bestowed only to the Indian writers writing in Indian languages included in the Eighth Schedule to the Constitution of India and English, with no posthumous conferral. 

The Bharatiya Jnanpith, a research and cultural institute founded in 1944 by industrialist Sahu Shanti Prasad Jain of the Sahu Jain family, conceived an idea in May 1961 to start a scheme "commanding national prestige and of international standard" to "select the best book out of the publications in Indian languages".