"Researchers have found a strong connection between the amount of money a person spends on bookshelves and that person's level of literacy. Therefore, they recommend buying more bookshelves to increase literacy." Why is the researchers' conclusion likely incorrect? A. The amount of money a person spends on bookshelves is correlated with literacy level. B. Reading books, not buying bookshelves, results in better literacy. C. Buying bookshelves, not reading books, results in better literacy. D. The number of books a person reads is correlated with literacy level.