Read the passage from The American Plague. People who had hidden themselves indoors began to emerge and walk the streets again. Shop doors opened for business, and ships once again sailed upriver to discharge cargo; farmers arrived, their wagons loaded with provisions bound for the markets of a very hungry city. Plans were even announced for the resumption of the stagecoach in early November. The city seemed to be awakening after a long, inescapable nightmare. The last line of the passage is a the central idea of the passage. b a supporting detail in the passage. c the conclusion drawn by the author. d a cause of the yellow fever epidemic.