Niyamgiri Hills are located in Odisha, spanning the Kalahandi and Rayagada districts, and they were in the news through 2010 because of Vedanta Resources' proposal to mine bauxite there. The hills are home to the Dongria Kondh tribal community, who consider the hills sacred and worship them as the abode of their deity Niyam Raja. In August 2010, the Ministry of Environment and Forests, acting on the recommendations of a committee headed by N. C. Saxena, rejected clearance for the mining project, citing violations of forest rights laws and the likely destruction of the tribal community's way of life and the local ecology. This decision was seen as a landmark case for tribal and environmental rights in India.
The other options refer to unrelated events. Y. S. Rajasekhara Reddy, the then Chief Minister of Andhra Pradesh, died in a helicopter crash in September 2009 in the Nallamala forest area, not Niyamgiri. The Naxalite Red corridor spans several states in central and eastern India, but Niyamgiri is not described as its headquarters. Niyamgiri also was not named the world's best trekking destination by Conde Nast Traveller.