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The correct answer is option 2, Krishna. The Nagarjuna Sagar Project is a dam constructed on the Krishna River. The Krishna River is one of the major rivers in South India and flows through the states of Maharashtra, Karnataka, and Andhra Pradesh. The Nagarjuna Sagar Project is located in the Nalgonda district of Andhra Pradesh and is one of the largest dams in India. It was constructed to provide irrigation water for agricultural purposes, as well as to generate hydroelectric power. The dam has a capacity of storing a large amount of water, which is then released to irrigate the surrounding farmland. The project has been instrumental in improving agricultural productivity in the region and ensuring a constant supply of water for irrigation.