Talk:GMAT Test Help/GMAT Sentence Correction Quizzes/Quiz 7

A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalities had been allowed to dump into the Great Lakes.

(A) reduced the amount of phosphates that municipalities had been allowed to dump (B) reduced the phosphate amount that municipalities had been dumping (C) reduces the phosphate amount municipalities have been allowed to dump (D) reduced the amount of phosphates that municipalities are allowed to dump (E) reduces the amount of phosphates allowed for dumping by municipalities

Plse check the 12 EDITION OF GMAT Official guide. The ans is D NOT A. Please make the changes.