The correct answer is A. P. C. Hembram.
A. P. C. Hembram was the first Chairman of Jharkhand Public Service Commission. He was appointed on 15 November 2000 and served till 31 October 2005. He was a member of the Indian Administrative Service (IAS) and held various positions in the government of Jharkhand. He was also the Vice-Chancellor of Ranchi University.
B. T. C. Soren is a politician from Jharkhand. He is the former Chief Minister of Jharkhand and the President of the Jharkhand Mukti Morcha (JMM). He was elected to the 16th Lok Sabha from the Dumka constituency in 2014.
C. G. Krishnan is a retired Indian Administrative Service (IAS) officer. He served as the Chief Secretary of Jharkhand from 2005 to 2007. He was also the Secretary of the Ministry of Personnel, Public Grievances and Pensions from 2007 to 2009.
D. S. D. Mandal is a retired Indian Administrative Service (IAS) officer. He served as the Chief Secretary of Jharkhand from 2009 to 2011. He was also the Secretary of the Ministry of Rural Development from 2011 to 2013.