The researchers in Text 2 would most likely respond to the conclusion in Text 1 (which suggests that polar bear populations affected by sea-ice loss are at great risk of extinction) by noting that it neglects the possibility of some polar bear populations adapting to changes in their environment. This is supported by their findings on the Svalbard polar bear population, which has shown resilience through changes in their diet and feeding strategies.
Thus, the best answer is:
(Choice C) By noting that it neglects the possibility of some polar bear populations adapting to changes in their environment.