The answer should be C if not then it is D
The definition of hygiene says cleanliness. A does not have to do with that. B does because keeping that clean prevents food diseases like salmonella. C has nothing to do with hygiene. D has nothing to do with being clean. So the answer would be B. I hope this helps!
When vaccinated, the disease that you are trying to protect yourself against is sent throughout your body in low doses. Because of these low doses, your immune system can build up a resistance to the disease.
