D wins.
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 municipalitieshad been allowed to dump -Its more about logical meaning - Municipalities are still dumping phosphates. 'Had been' says prior to 1972 municipalities were dumping reduced amount - that is illogical. If amount was already reduced then why an agreement was held?
...
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 municipalitieshad been allowed to dump -Its more about logical meaning - Municipalities are still dumping phosphates. 'Had been' says prior to 1972 municipalities were dumping reduced amount - that is illogical. If amount was already reduced then why an agreement was held?
...
