Question

what is the most likely reason the author included an explanation of herd immunity? a to describe how disease spreads b to show that vaccines benefit a community c to compare the diseases that vaccines control d to explain that it is not necessary to get vaccinated

Explanation:

Herd immunity occurs when a large enough portion of a community is vaccinated, protecting those who can't be vaccinated. This shows the community - wide benefits of vaccines. Option A is about disease - spread which is not the main point of explaining herd immunity. Option C is about comparing diseases which is not relevant. Option D is incorrect as herd immunity actually emphasizes the importance of vaccination for community protection.

Answer:

B. to show that vaccines benefit a community