Rearrange the following five sentences/group of sentences (A), (B), (C), (D), and (E) in the proper sequence to form a meaningful paragraph; then answer the questions given below them.

(A) When a sufficiently large percentage of a population has been vaccinated, herd immunity results. 

(B) In stimulating the body's adaptive immunity, they help prevent sickness from an infectious disease.

(C) Vaccination is the administration of a vaccine to help the immune system develop protection from disease.

(D) Herd immunity protects those who may be immune-compromised and cannot get a vaccine because even a weakened version would harm them. 

(E) Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism.