A 1972 agreement between Canada and the United Statesreduced 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 --Had is not required as the sentence is telling a fact
(B) reduced the phosphate amount that municipalities had been dumping --amount of phosphate is preffered than phosphate amount
(C) reduces the phosphate amount municipalities have been allowed to dump --
...
(A) reduced the amount of phosphates that municipalities had been allowed to dump --Had is not required as the sentence is telling a fact
(B) reduced the phosphate amount that municipalities had been dumping --amount of phosphate is preffered than phosphate amount
(C) reduces the phosphate amount municipalities have been allowed to dump --
...
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