If it is only one species in question, at a particular place, the group of that species and its numbers will be described with the term population. Population simply means the total number of individuals of a a particular species. This can refer to the number of individuals only at a particular area, such as Alaska's Arctic National Wildlife Reserve in this case, or it can refer to the whole population in every region where the species lives, depending on the requirements.
Population is the term that is used to describe a group of arctic foxes that live in part of Alaska's Arctic National Wildlife Refuge. The correct option among all the options given in the question is the third or the second last option. The area covered by Arctic National Refuge is approximately 19.6 million acres. It has a variety of wild animals living in it.
