The correct answer is: d) All of the above.
Major hydropower projects have been planned/developed on the Subansiri, Lohit, and Kameng rivers in Arunachal Pradesh.
The Subansiri Hydroelectric Project is a proposed 2,000 MW hydroelectric power project on the Subansiri River in Arunachal Pradesh. The project is being developed by the National Hydroelectric Power Corporation (NHPC).
The Lohit Hydroelectric Project is a 1,200 MW hydroelectric power project on the Lohit River in Arunachal Pradesh. The project is being developed by the North Eastern Electric Power Corporation (NEEPCO).
The Kameng Hydroelectric Project is a 2,000 MW hydroelectric power project on the Kameng River in Arunachal Pradesh. The project is being developed by the NHPC.
These projects have been controversial due to concerns about their environmental impact. However, they are seen as important for the development of Arunachal Pradesh and for meeting the energy needs of India.