What you get from a one-unit increase in an activity that you enjoy is called . A. an efficient benefit B. marginal benefit C. marginal increase D. a marginal activity When you spend four hours studying comma your mark on an exam is 80 percent. And if you spend five hours studying comma your mark is 85 percent. To study for the extra hour, you give up playing cards for that hour with your friends. The marginal benefit from studying one more hour is . The marginal benefit from studying is measured by . A. the mark of 85 percent; the card game you must give up B. the 5 percent increase in your mark; the total time you spent studying C. the 5 percent increase in your mark; the card game you must give up D. the 5 percent increase in your mark; the card game you are willing to give up