The process is called homeostasis. It is important for living things to maintain a constant or balanced internal environment to survive. Homeostasis is not just one but a collective term to all processes needed to keep that balance.
The answer is C.Petroleum I hope this helped ^^
As for my examinations, i would say B. Why? Well, if you would stay out in the sun a lot, you will get cancer, it has ultraviolet radiations, and rays, that is why when you go to the beach, you put on sunscreen, or a hat on.
Hope that this would help you! =)