Which statement best introduces a character as someone who is smart but easily distracted? A) Try as he might, Kevin couldn't follow what his teacher was saying in class. B) Wendy always turned in her work on time, and was repeatedly praised by all of her teachers. C) Mike often found himself lost in his own thoughts, since the real world seemed entirely too mundane. D) George was so busy daydreaming about a calculus equation that he didn't hear the teacher when she called on him.

Read this excerpt from "edward jenner and the history of smallpox and vaccination.” smallpox was introduced to europe sometime between the fifth and seventh centuries and was frequently epidemic during the middle ages. the disease greatly affected the development of western civilization. the first stages of the decline of the roman empire (ad 108) coincided with a large-scale epidemic: the plague of antonine, which accounted for the deaths of almost 7 million people. the arab expansion, the crusades, and the discovery of the west indies all contributed to the spread of the disease. unknown in the new world, smallpox was introduced by the spanish and portuguese conquistadors. the disease decimated the local population and was instrumental in the fall of the empires of the aztecs and the incas. similarly, on the eastern coast of north america, the disease was introduced by the early settlers and led to a decline in the native population. before it reached the new world, smallpox played a role in