How has air pollution contributed to the decline in caribou populations?

According to scientists the causes of the global caribou decline are straightforward rapidly rising arctic temperatures are throwing caribou out of sync with the environment in which they evolved oil and gas development, mining, logging, and hydropower projects in the far north are impinging on the caribou’s range and though not a major factor hunting is further depleting already beleaguered caribou populations.

The answer is b. hope this !