What Is Herd Immunity

What is herd immunity?

A) the protection offered to you by the size of your country, as it limits potential outside contact with an infected individual
B) at least 25 percent of the population needs to be immune before those too poor to receive the vaccination can be protected
C) small communities protect their children from being exposed to outside pathogens by limiting the contact their children have with outside visitors or workers
D) the only protection available to those who are unable to receive immunizations due to medical reasons
E) the only protection available to those who choose not to receive immunizations due to religious belief