All of the Following Statements About Emissions Trading Are Correct

All of the following statements about emissions trading are correct except

A) The success of emissions trading programs depends on how low the initial cap is set.
B) Sulfur dioxide emissions were reduced by the emissions trading system in the United States.
C) Estimates of the expense of reducing sulfur dioxide emissions in the U.S. a.via emissions trading were overestimated by 90%.
D) The success of emissions trading programs depends on how often the cap is lowered to promote continuing innovation in air pollution prevention and control.
E) All of these answers are correct.