Read this excerpt from "Edward Jenner and the History of Smallpox and Vaccination.” In 1757, an 8-year-old boy was inoculated with smallpox in Gloucester; he was one of thousands of children inoculated that year in England. The procedure was effective, as the boy developed a mild case of smallpox and was subsequently immune to the disease. His name was Edward Jenner.

How does this excerpt help support the main claim of the passage that Jenner helped spread the practice of immunization?

It includes evidence that inoculation was used in Gloucester.
It points out that Jenner was one of thousands of children in England.
It provides information about Jenner’s early experiences with smallpox.
It indicates that smallpox spread throughout England in the eighteenth century.