Answer: C. Humans have avoided animal habitats.
Step-by-step explanation:
Emerging diseases are those diseases which occur frequently after a single tenure of infection. These disease poses a serious challenge over the immune system of the body and it becomes incapable of recovery and can also be lethal.
Humans have avoided animal habitats. is the correct option this is because of the fact that on rare instances the association of animals was proven to be infectious to humans. Thus animal habitat avoidance cannot prove to be the concern for the re-emergence of a disease.