The correct option is 2 and 3 only. The Animal Welfare Board of India was actually established under the Prevention of Cruelty to Animals Act, 1960, not the Environment (Protection) Act, 1986, making statement 1 incorrect. The National Tiger Conservation Authority, recognized as a statutory body, oversees the implementation of the Project Tiger scheme, as stated in the Wildlife Protection Act, 1972. Additionally, the National Ganga River Basin Authority is indeed chaired by the Prime Minister to ensure the holistic management of the Ganga River Basin, aligning with the government’s commitment to inter-sectoral coordination for river conservation. This understanding aligns well with the context of environmental governance and conservation efforts in India as crucial themes in the UPSC syllabus.