Respuesta :
I would say the answer is D because just like in example, chicken pox is not always safe, and healthy kids in chicken pox party can also get infected and become very sick instead of just getting exposed to them. Vaccine however just basically gave us immunity to the disease without the getting sick step.
Answer:
Option d)Vaccines allow for building immunity without harmful exposure because not all viruses are safe to be exposed to.
Explanation:
The concept of a vaccine was started by Edward Jenner. This was after a smallpox vaccine was successfully carried out on a patient on a farm. A vaccine, is a special replica of the bacteria or virus that is inoculated into the patient's body to activate the immune system. As the "bacteria" multiplies, the body produces special and specific body cells to target the organism. This produces the active acquired immunity that is needed to protect the person from future attacks by the organism in life.