Total 60 Bassoon Greg's PPF 50 40 Wirt's PPF 30 20 10 Total Clarinet 0 10 20 30 40 50 Greg and Wirt make musical instruments. The graph above shows their individual Production Possibility Frontiers (PPFs). Greg's PPF is the green, solid line. Wirt's PPF is the orange, dotted line. Which of the following statements is true? O a. They both have the comparative advantage in both instruments. O b. Writ has the comparative advantage in making bassoons while Greg has the comparative advantage in making clarinets. O c. Writ has the comparative advantage in making both instruments. O d. Writ has the comparative advantage in making clarinets while Greg has the comparative advantage in making bassoons. O e, Greg has the comparative advantage in making both instruments