Cap-and-trade systems (or the tradable emission permit system in the U.S.) was a constructed market created by and constituting which of the following? a. The U.S. EDF; allowances of pollution of all pollutants b. The U.S. EPA; monthly allowances of pollution of particular pollutants c. The U.S. EPA; annual allowances of pollution of particular pollutants d. The U.S. EDF; allowances of pollution of particular pollutants