For the following trade relationship, explain the likely source of the comparative advantage of each of the exporting countries. a. The United States exports airplanes to China, and China exports clothing to the United States. It is cheaper to produce airplanes using many highly skilled workers, and it is cheaper to produce clothing using many unskilled workers. The United States has a more highly skilled labor force than China has. b. The United States is a pioneer in heavier-than-air flight and has continued to commit significant resources to producing airplanes. China has extended its historical dominance in silk to other textiles and established itself as the global leader in textiles. c. China has an absolute advantage in the the production of clothing, and the United States has an absolute advantage in the production of airplanes. d. The United States needs more airplanes than China. The United States produces large quantities of planes and winds up selling some abroad. China, the most populous nation on earth, needs large quantities of clothing. It produces large quantities of clothing and winds up selling some abroad.