The correct answer is: D. Jagjivan Ram
Jagjivan Ram was the first Dalit minister in the Indian government. He was also the president of the All India Depressed Classes League, which fought for the rights of Dalits. In 1932, he led a group of Dalits into the Baidyanath Dham temple in Deoghar, which was previously off-limits to Dalits. This was a major victory for the Dalit movement and helped to raise awareness of the discrimination faced by Dalits in India.
Shri Krishna Singh was a freedom fighter and the first Chief Minister of Bihar. He was a member of the Indian National Congress and played a major role in the independence movement. He was not involved in the Dalit movement.
Anugrah Narayan Sinha was a freedom fighter and the second Chief Minister of Bihar. He was a member of the Indian National Congress and played a major role in the independence movement. He was not involved in the Dalit movement.
Dr Rajendra Prasad was the first President of India. He was a member of the Indian National Congress and played a major role in the independence movement. He was not involved in the Dalit movement.