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The correct answer is option 1: Sutlej. The reservoir Gobind Sagar is located on the Sutlej River.
Option 2: Son is incorrect because the Son River is located in central India and does not flow through the area where the Gobind Sagar reservoir is located.
Option 3: Rihand is incorrect because the Rihand River is a tributary of the Son River and is also not located in the same region as the Gobind Sagar reservoir.
Option 4: Narmada is incorrect because the Narmada River flows through central India and does not pass through the region where the Gobind Sagar reservoir is situated.
Therefore, the only correct option is option 1, Sutlej. The Sutlej River flows through the states of Himachal Pradesh and Punjab and the Gobind Sagar reservoir is situated on this river.