Suppose an economy is producing gasoline. Which of the
following will be true?

a. The marginal benefit of the 100th gallon is bigger than the marginal
benefit of the 5th gallon

b. The marginal benefit of the 100th gallon is smaller than the marginal
benefit of the 5th gallon

c. The opportunity cost of producing the 100th gallon is smaller than the
opportunity cost of the 5th gallon