GMAT语法时态问题A 1972 agreementbetween Canada and the United Stat

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GMAT语法时态问题
A 1972 agreementbetween Canada and the United States （reduced the amount of phosphates
that municipalitieshad been allowed to dump） into the Great Lakes.
(A) reduced the amountof phosphates that municipalities had been allowed to dump
(B) reduced thephosphate amount that municipalities had been dumping
(C) reduces thephosphate amount municipalities have been allowed to dump
(D) reduced the amount ofphosphates that municipalities are allowed to dump
(E) reduces the amountof phosphates allowed for dumping by municipalities
OG里的语法开篇简述给出过时态的解释：
现在完成时:过去发生and continues into the present
现在完成进行：过去发生 continue into the present and may continue into the future
那么这题里说法力规则过去生成,持续到现在,为什么OG给的解释说C have been allowed不对啊,现在完成时表达持续的动作或影响我觉的没错啊
而且OG说用are allowed说明现在仍有效,were allowed说明现在已经无效
有点晕了..

在1972年的协议达成之前,应该有相关协议允许各个州向五大湖去投入的磷酸盐数量,这里就用had been allowed是指1972年以前的协议允许投入量,1972年的协议只是把以前的允许投入量减少了

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