This Figure, Based on Data Collected by the National Institute

This figure, based on data collected by The National Institute of Allergy and Infectious Diseases, graphically illustrates

A) As increasingly more individuals in a community are vaccinated against a particular pathogen, future outbreaks of the disease are limited to fewer individuals because fewer people will become infected and then pass it on.
B) As individuals in a community become ill, increasingly more individuals either become ill or think they are becoming ill as they find out about the illness from friends, family, and the media.
C) As increasingly more individuals in a community are vaccinated against a particular pathogen, future outbreaks of the disease are limited to fewer individuals because fewer people think they can become ill. Just the idea of vaccines protecting from disease will make people think they are protected so they will not experience any symptoms.
D) As a population of individuals is infected with a particular pathogen, more and more people will become infected. This is beneficial because everyone will always survive, and their offspring will be immune to any future infections.