A college is charging students a below-equilibrium tuition to attend the college when the demand to attend the college rises. It's likely that the non-dollar rationing devices to attend the college (GPA, standardized test scores) will intensify (e. g., the GPA to be admitted to the college might be raised) if a. the tuition to attend the college does not change. b. the tuition to attend the college rises to its equilibrium level. c. the tuition to attend the college declines. d. a and c