Assume that there is a high statistical correlation between college attendance and individual earnings. Given this, the author would most probably agree with which one of the following statements about the cause-effect relationship between college attendance and income? A. Someone's potential earnings may be affected by other variables, like wealth or intelligence, that are also associated with college attendance. B. Someone who attends graduate school will be rich. C. Someone who attends graduate school will earn more money than someone who does not. D. Someone who attends college will earn more money than someone who does not attend college. E. Someone who attends college will earn more money only because she does attend college.