In contrast to environmentalists proposals to limit emissions of certain pollutants, the administration 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. administration's proposal was a call for mandatory restrictions, which include
E. administration's proposal would call for mandatory restrictions on