Explanation:

Only statements 2&3 are correct.

• Dandeli forest is located in the Uttara Kannada district of Karnataka and is part of the Western Ghats, a globally recognized biodiversity hotspot.

• The Kali Tiger Reserve is a protected area adjacent to the Dandeli Forest..

• The Tiger Reserve comprises two important protected areas of the region viz., Dandeli Wildlife Sanctuary and Anshi National Park.

• The invasive eupatorium weed is replacing native grasses in the forest undergrowth, impacting herbivores as it is not a preferred food source and is susceptible to fires. 

Hence option 2nd is correct.