The correct answer is option 4, Uttar Pradesh. The Rihand Valley Project is located in the state of Uttar Pradesh. The project is a joint venture between the state government and NHPC Limited, which is the country`s premier hydroelectric power company. It is situated on the Rihand River, a tributary of the Son River. The main aim of the project is to generate hydroelectric power and provide irrigation facilities to the surrounding areas. The Rihand Dam, also known as Govind Ballabh Pant Sagar, is a part of the project and is one of the largest reservoirs in India. It has a capacity of approximately 9.9 billion cubic meters and provides water for various purposes including agriculture, industrial use, and drinking water supply. The project has significantly contributed to the development of the region by providing electricity and improving the livelihoods of the local population.