Answer:
In my opinion i think fevers are helpful because when we are feeling bad we can test our temperature with a thermometer. Also fevers turn on the body's immune system. So therefore they help the body fight infection.
Explanation:
I would say D: appetite;
appetite is a strong desire or liking for something. At Holidays there is typically a large assortment of food that maybe you don't eat on a regular basis, therefore would have a big appetite for them.