Joothan, a landmark autobiographical work of Dalit writing in Hindi, was written by

The correct answer is A, Omprakash Valmiki. Joothan is the autobiography of Omprakash Valmiki and is regarded as a landmark of Dalit writing in Hindi. It records the humiliations of caste that the writer faced in school and at work, and the title itself refers to the leftover food that his community was expected to accept.

Option B, Premchand, was a novelist and short story writer whose works include Godan, Gaban and Nirmala, all fiction rather than autobiography. Option C, Harivansh Rai Bachchan, was a poet best known for Madhushala, and he did write a multi volume autobiography beginning with Kya Bhoolun Kya Yaad Karun, but not this book. Option D, Phanishwar Nath Renu, wrote the novel Maila Anchal, a work of regional fiction set in rural Bihar, and he is remembered for that novel rather than for any autobiography.