Correct Option (a):
The pairs 2, 3, and 4 are correctly matched.
- Sabarigiri is a significant hydroelectric project located in Kerala, harnessing the Pamba River for power generation.
- Ghatprabha is primarily an irrigation project situated in Karnataka, utilizing the Ghatprabha River, a tributary of the Krishna River, to provide water for agricultural purposes.
- Ramganga is a multipurpose project in Uttarakhand, built across the Ramganga River. It serves multiple objectives including irrigation, hydropower generation, and flood control.
Incorrect Options:
Statement 1 is incorrectly matched. Idukki is a major hydroelectric project in Kerala, constructed on the Periyar River, known for its arch dam. It is not a thermal power station.
Therefore:
- Option (b) "1, 2, 3 & 4" is incorrect as statement 1 is false.
- Option (c) "3 & 4" is incomplete as statement 2 is also correctly matched.
- Option (d) "1 & 2" is incorrect because statement 1 is false, and it omits statements 3 and 4 which are correctly matched.