GMAT Sentence Correction (SC) | Re: In contrast to environmentalists proposals to limit

In contrast to environmentalists' proposals to limit emissions of certain pollutants, theadministration proposed calling for mandatory restrictions of only three such pollutants from power plants-mercury, sulfur dioxide, and nitrogen oxides-and the plan would delay such cuts until 2010 or later.
A. administration proposed calling for mandatory restriction of
B. administration proposed a call for mandatory restrictions, including those for
C. administration, proposing mandatory restrictions on
D.