Solution:Nagarjuna Sagar Dam is built across Krishna river. All other options are correct. Hence, option (c) is the correct answer. It is built between the Nalgonda district of Telangana and the Guntur district of Andhra Pradesh. It is built across the River Krishna.It is the largest and highest masonry dam in the world. The dam is 150m tall and 1.6 km long. The dam has a storage capacity of nearly 11,472 million cubic meters and an irrigation capacity of 9.81 lack acres of land. It derives its name from a nearby hillock and island called Nagarjunakonda, where an ancient Buddhist Guru had once lived.
It is also one of the earliest projects built in post-independence India for irrigation and hydroelectricity generation. The construction of the dam commenced in 1956 and was completed by 1967.
This dam supports the national grid with its electric power and provides irrigation water to five districts, including Khamman District, Nalgonda District, Guntur District, Prakasam District and Krishna District. As per the provisions of the Andhra Pradesh Reorganisation Act, 2014, Nagarjunasagar dam is controlled and supervised by Telangana.