The correct option is 2 and 3 only because the Bombay Natural History Society (BNHS) is primarily a non-governmental organization dedicated to the conservation of nature through research, education, and public awareness, but it is not an autonomous organization under the Ministry of Environment and Forests. It effectively engages the public by organizing nature trails and camps, which fosters environmental awareness and education, aligning with the broader goals of conservation. This distinction is crucial for understanding the operational independence of environmental NGOs versus government bodies within the framework of biodiversity conservation efforts in India.