Option 1 - This option suggests that Farakka Dam is located on the Krishna River, Tehri Dam on the Ravi River, Thein on the Ganga River, and Nagaijuna on the Bhagirathi River. This is incorrect as the placements of the dams and rivers do not match.

Option 2 - This option suggests that Farakka Dam is located on the Ravi River, Tehri Dam on the Ganga River, Thein on the Ganga River (again), and Nagaijuna on the Bhagirathi River. This is incorrect as the placements of the dams and rivers do not match.

Option 3 - This option suggests that Farakka Dam is located on the Ganga River, Tehri Dam on the Ravi River, Thein on the Bhagirathi River, and Nagaijuna on the Krishna River. This is the correct matching as all the dams are placed on the correct corresponding rivers.

Option 4 - This option suggests that Farakka Dam is located on the Bhagirathi River, Tehri Dam on the Krishna River, Thein on the Ravi River, and Nagaijuna on the Ganga River. This is incorrect as the placements of the dams and