a leg muscle relaxing after exercise a bacterial population in the bloodstream several viral particles on the skin carbohydrates being digested in the stomach
I gave my students this multiple choice question: Which factor will most likely cause a person to develop a fever?

Only one answer is correct among these 4 choices:
- a leg muscle relaxing after exercise
- a bacterial population in the bloodstream
- several viral particles on the skin
- carbohydrates being digested in the stomach

Could you tell me which one is correct?

a bacterial population in the bloodstream