When you calculate your true costs of going to college, what portion of your room-and-board expenses should be included? a. you should include only the amount by which your room-and-board expenses exceed the expenses for rent and food if you were not in college. b. you should include only the amount by which your room-and-board expenses exceed the income you earn while attending college. c. your full room-and-board expenses should always be included. d. none of your room-and-board expenses should ever be included.