Which sentence should be added to the introductory paragraph at the point indicated to best provide background information about the topic? What happens when a dentist and a candymaker meet? Together, William Morrison, a dentist, and John C. Wharton, a candymaker, invented the modern version of cotton candy, a treat popular with both the young and old. The two sold their cotton candy at the Paris Exposition in 1900 and the St. Louis World's Fair in 1904 for 25¢ a box, and the rest is history. The fascinating story of how cotton candy found its place in American culture is as sweet as the treat itself.

A.
Though a form of the sweet treat dates back to the 1400s, today's cotton candy became popular after Morrison and Wharton patented the electric sugar-spinning machine in 1897.

B.
Dentists agree that cotton candy or any sugary food is fine in moderation, but too much can lead to serious dental problems, such as cavities, tooth decay, halitosis, and gum disease.

C.
Another popular candy with an interesting history is the lollipop, which was invented by a 20th-century candymaker who took the sticks used to mix the candy emulsion home to his kids.

D.
Modern cotton candy is often sold on paper cones, but previous packaging included cardboard boxes, paper bags, and even small silver cups that could be refilled again and again.