请教一道逻辑题

Seven countries signed a treaty binding each of them to perform specified actons on a ceratin fixed date, with the actions of each conditional on simultaneous action taken by the other countries. Each country was also to notify the six other countries when it had completed its action.

The simultaneous -action provision of the treaty leaves open the possibility that

(A)the compliance date was subject to postponement ,according to the terms of the treaty.

(B)one of the countries might not be required to make any changes or take any steps in order to comply with the treaty, whereas all the other countries are so required

(C)each country might have a well-founded excuse,based on the provision, for its own lack of compliance.

(D)the treaty specified that the signal for one of the countries to initiate action was notification by the other countries that they had completed action.

(E)there was ambiguity with respect to the date after which all actionscontemplated in the treaty are to be complete.

现在很怕做这类型的题目。虽然这种类型的题目出现的机会不会很大，但还是有很大的恐惧感。向大家请教一下做这类题目的解题关键是什么？

答案是c

没太看懂题，汗。还是第一次看到这种类型的题。

是呀，这是一条很久之前的机经，我读完题目，就只是感到混乱（而且我做了300道左右的cr，大约遇到过4-5题这样的题目，每次都做错，完全摸不着头脑）

有谁可以帮我解答一下呀

Seven countries signed a treaty binding each of them to perform specified actons on a ceratin fixed date, with the actions of each conditional on simultaneous action taken by the other countries. Each country was also to notify the six other countries when it had completed its action.

The simultaneous -action provision of the treaty leaves open the possibility that

(A)the compliance date was subject to postponement ,according to the terms of the treaty. -日期是否变，无关。

(B)one of the countries might not be required to make any changes or take any steps in order to comply with the treaty, whereas all the other countries are so required-不符合，each of them to perform specified action，每个国家都要采取行动

(C)each country might have a well-founded excuse,based on the provision, for its own lack of compliance.-就是说因为每个action都是有前提条件的，而前提条件是其他国家会采取某个行动，而这样的话，就产生了一个死循环，就是没有国家开始的话，这个合约就无法生效，而且每个国家都有理由为自己辩护。

关键是这题的问题，这个provision 会带来的可能后果是什么？

(D)the treaty specified that the signal for one of the countries to initiate action was notification by the other countries that they had completed action.-重复原文，无意义。

(E)there was ambiguity with respect to the date after which all actions contemplated in the treaty are to be complete. -完成后的日期无关的。

open for discussion.

简单的说就像加工一件衣服    你先把袖子 正身  被身 窜一起了 我才能往上面引花纹    这样我就有理由偷懒了   因为你还没有把你的工作完成呢 我不用因花纹！

而文中描述的现象可能是一个死循环，都要等待某个国家的完成些什么。