Vaccinating people against a communicable disease such as influenza not only reduces the chances that the person vaccinated will catch the disease but also reduces the probability that an epidemic of the disease will occur

Which of the following statements is true?
A) Reducing the chances that the person vaccinated will catch the disease is a private benefit while reducing the probability of an influenza epidemic is a social benefit.
B) Vaccinating people against communicable diseases yields private benefits in excess of social benefits.
C) Reducing the chances that the person vaccinated will catch the disease is a private cost while reducing the probability of an influenza epidemic is a social benefit.
D) The benefits of the influenza vaccination outweigh the costs.

A