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

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

1. the compliance date was subject to postponement, according to the terms of the treaty.
   

2. Oe of the countries might not be required to make any changes or take any steps in orfer to comply witht the treaty, whereas all the other countries are so required.

3. Each country night have a well-founed excuse, based on the provision, for its own lack of compliance

4. 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 anbiguity with respect to the date after which all actions contemplated in the treaty are to be complete.

The recommended answer is C. However, I think A is the correct answer. Because all seven countries take simulataneous action indicate that no countires can initiate the next action until all the other six countries complete the action. So, for each action included in the special atcions, it takes time as long as the last country can complete it. That means: Time(special actions) = max Time (action 1) + max Time (action 2) +... Thus the compliance date was subject to postponement.