Consider the production possibility frontier for the U.S. below. (It is not necessarily drawn to scale.) What is the opportunity cost of producing a bushel of wheat? Corn (bushels) 100 50 150 300 Wheat (bushels) 0 O a. 3 bushels of corn Ob. 300 bushels of wheat O c. 1/3 bushels of corn O d. 100 bushels of corn