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2. A 1972 agreement between LACE>CanadaLACE> and the LACE>United StatesLACE> reduced the amount of phosphates that municipalities had been allowed to dump into the LACE>Great LakesLACE>.
(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（A）
(E) reduces the amount of phosphates allowed for dumping by municipalities
I personally believe that the answer is C. The 1972 agreement only can reduce the amount of phosphate be allowed to dump after 1972 not before 1972. The right tense should be present perfect.
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