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
The use of past perfect tense is incorrect in the sentence. Though “ a 1972 agreement” might tempt you to mark A, we have to understand the use of past perfect tense. The past perfect tense is used for the former event when there are two events in the timeline.
The use of “had been allowed” means that this was a former event (not the case now)
Hence the use of past perfect tense is
incorrect.
(B) reduced the phosphate amount that municipalities
had been dumpingThe use of past perfect continuous tense is incorrect. Past perfect continuous tense is used to talk about an action that started in the past, continued for a while (action in progress- ing form), and
ENDED in the past.
Incorrect.
(C)
reduces the phosphate amount municipalities
have been allowed to dump
We are talking about a 1972 agreement. We cannot use simple present tense- "reduces" to talk about what was decided in the agreement.
Incorrect.
(D)
reduced the amount of phosphates that municipalities
are allowed to dump
Generally, municipalities are allowed to dump x amount of phosphates into the Great Lakes. But a 1972 agreement reduced that amount.
The agreement between Canada and the US reduced the amount of phosphates that municipalities are allowed to dump into the Great Lakes.
Correct.
(E)
reduces the amount of phosphates allowed
for dumping by municipalities
same as C.
allowed for dumping is not idiomatic.
Vishnupriya
GMAT Verbal SME