PART A: Which statement best expresses the central idea of the text? A Vaccines can be a dangerous way to protect the body from diseases, as you have to initially expose the body to disease. B Vaccines are not necessary to protect against diseases, as the body will automatically remember certain diseases and protect against them. C The immune system struggles to remember viruses that it has experienced and needs the help of vaccines to make memories of them. D A vaccine is developed by familiarizing your body with a pathogen so that it can recognize it and keep it from spreading within you and to others.

D. A vaccine is developed by familiarizing your body with a pathogen so that it can recognize it and keep it from spreading within you and to others.

Explanation:

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"Vaccines" are developed in order to prevent a person from getting infected with a particular disease, thereby also preventing him to spread that disease to others.

Once the person gets a vaccine, the small strains of pathogen are introduced into the body and it results to an immune response. This will help the body know how to fight off the disease once it encounters such in the future.

So, this explains the answer.