Under the Second Phase of the Compromise Acid Rain Regulation

Under the second phase of the compromise acid rain regulation proposed by the George H. W. Bush administration in 1990, which of the following was true?

A) All new power plants were required to install smokestack scrubbers.
B) Specified power plants could decide for themselves how to reduce their emission of sulfur by a fixed amount.
C) All new power plants were required to burn low-sulfur coal.
D) Specified power plants were allowed to buy and sell sulfur dioxide allowances.
E) All new power plants were required to construct small smokestacks with pivoting caps.