a question about sc
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) reduced the amount of phosphates allowed for dumping by municipalities
ＯＧ的答案是D，而LZM的答案是A，我个人更倾向A，你们认为是哪个答案呢？
谢谢：） A is better, but "municiplates were allowed" shall be much better
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