Read this excerpt from "Edward Jenner and the History of Smallpox and Vaccination.” Scientific advances during the two centuries since Edward Jenner performed his first vaccination on James Phipps have proved him to be more right than wrong.

Which is the author’s central claim in this excerpt?

Jenner performed his experiments very long ago in a different kind of world.
There have been important scientific advances in the past two centuries.
Jenner’s work is still relevant and important today.
Few changes are needed to improve the vaccination.

Which statement best describes how these paragraphs develop the central idea of the article? a- they elaborate on the idea that the offer has been made with youngsters in mind. b- they provide additional information as to why the prize is a wagon instead of something else. c- they support the idea that the wagon is attractive to youngsters and is a worthy prize. d- they introduce the idea that the newspaper is a generous organization. read paragraphs 4 and 5. the disc wheel coaster wagon is thirty-six inches long and sixteen inches wide. the coaster is built exactly like a high-powered automobile. the disc wheels have rubber tires and true roller bearings. it runs as smoothly as an eight-cylinder automobile. it is built of the strongest wood and is equipped with a reliable hand brake, enabling the owner to stop in an instant. the tongue—usually the first thing about a wagon to break and render the wagon unserviceable—is so stout that a man can jump on it without breaking it.