Consider the following pairs : Reservoirs : States 1. Ghataprabha : Telangana 2. Gandhi Sagar : Madhya Pradesh 3. Indira Sagar : Andhra Pradesh 4. Maithon : Chhattisgarh How many pairs given above are not correctly matched ?

Option (c) is correct because three out of the four pairs are mismatched: Ghataprabha is located in Karnataka (not Telangana), Indira Sagar is in Madhya Pradesh (not Andhra Pradesh), and Maithon is in Jharkhand (not Chhattisgarh). Option (b) is the most tempting wrong choice if a candidate mistakenly believes Indira Sagar is in Andhra Pradesh (perhaps confusing it with the Polavaram project) or misidentifies the location of the Maithon dam. The core concept being tested is the geographical distribution of major multipurpose river valley projects and reservoirs across various Indian states.