Answer:
A. Your breathing rate increases.
Step-by-step explanation:
All you need to do is to eliminate the last two answers. B. If you have a fever and you start to shiver but you are hot it is because it is an internal response to restore homeostasis. It can also just be a response to when you are cold.
C. If you feel hot you are going to start sweating eventually which just means your body is trying to cool you down.
If your heart rate increases it means that you are either doing physical activity or you are using an external source to get your heart rate up. Your heart starts beating faster so it can pump more blood to the parts of your body that need it. The blood then brings with it oxygen, energy, and protein to fuel you, but you can help by eating something sustainable and/or drink water.