I will go withD
There was an agreement in 1972.
The agreement puts a limit on amount of phosphates.
That limit was put into effect from 1972 till present date.
Municipalities are still allowed to dump phosphates in Great Lakes but the amount is reduced.
I think D is clear in tense and meaning.
A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalitiesare allowed to dump into the Great Lakes.
...
There was an agreement in 1972.
The agreement puts a limit on amount of phosphates.
That limit was put into effect from 1972 till present date.
Municipalities are still allowed to dump phosphates in Great Lakes but the amount is reduced.
I think D is clear in tense and meaning.
A 1972 agreement between Canada and the United States reduced the amount of phosphates that municipalitiesare allowed to dump into the Great Lakes.
...
.jpg)
