Correct Option (B)
Assumption 2 is correct. The passage explicitly states, "The Himalayan ecosystem is highly vulnerable to damage, both due to geological reasons and on account of the stress caused by increased pressure of population, exploitation of natural resources and other related challenges." This indicates that ecosystems can be adversely affected by both natural factors (geological reasons) and anthropogenic pressures (population, resource exploitation, climate change).
Incorrect Options:
Assumption 1 is incorrect. The passage notes that "exploitation of natural resources" contributes to stress on the Himalayan ecosystem. However, it does not advocate for the complete avoidance of natural resource exploitation. The statement "exploitation of natural resources should be completely avoided" represents an extreme position not supported by the text, which focuses on managing challenges and conscious conservation efforts.
Assumption 3 is incorrect. The passage highlights that the Himalayan biodiversity hotspot is vulnerable to climate change, with threats including "possible loss of genetic resources and species, habitats and concomitantly a decrease in ecosystem services." While it emphasizes the serious implications of endemic loss and the reduction of ecosystem services, the passage does not state that the loss of endemic diversity directly leads to the extinction of entire ecosystems. This assumption makes an inference that goes beyond the information provided in the text.