The correct option is D P Sainath
P Sainath travelled around India gathering the experiences of the Dalits. He noticed that untouchability and caste discrimination was still being practised against Dalits or Scheduled Castes. A Dalit had to drink from separate cups at a tea stall, they could not use the common handpump, and barbers refused to serve them. Sainath elaborated his views in a series of news reports in "The Hindu".