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Explanation:
Statement 1 is incorrect because the Silent Valley National Park is not located in the Nallamalai range but rather in the Nilgiri hills. Nallamalai range is part of Eastern Ghats whereas Silent Valley is part of Western Ghats.
Statement 2 is correct. The Pathrakkadavu Hydroelectric project is proposed near the Silent Valley National Park. It is a controversial project due to environmental concerns, given the proximity to a region known for its rich biodiversity.
Statement 3 is also correct. The Kunthi River does originate in Silent Valley`s rainforests. It is often referred to as `Pristine Kunthi River` due to the pure water and the surrounding biodiversity.
Thus the correct answer is option 3 - only statements 2 and 3 are correct.