Paul Schumer and Jim Miller, two analyst at a research institute, discuss the rising costs of higher education in their country. Paul feels that escalating tuition fees in colleges and universities are indicative of a bubble in the higher education market. According to Jim, however, the rising costs are the result of better quality education being provided by the institutions in recent years. Which of the following , if true, will streghten Jim's claim? A. The gap between the earnings of college graduates and nongraduates is increasing. B. The demand for student loans has fallen in the last few years. C. Students in most colleges complain of bad infrastructure. D. Salary levels in the education sector have remained more or less unchanged over the last few years.