Conservation Biologists in the United States Are Protecting Habitat of Endangered

Conservation biologists in the United States are protecting habitat of endangered species at the northern end of their current ranges.What is the rationale for this strategy?

A) As global temperatures warm,biomes will move to the north.
B) Animals tend to migrate to the north.
C) Tectonic plates are shifting to the south.
D) There are fewer people in the north,so there is more habitat available.
E) Biodiversity is higher the farther north you go from the equator.