GMAT Critical Reasoning (CR) | Re: Seven countries signed a treaty binding each of them to

VeritasPrepKarishma

While I agree that no answer is better than C, I still not clear with E.

Assume that there are 7 countries: A1, A2, A3, A4, A5, A6, A7

Because the argument only refer to a certain date of a type of action X for example the 1/1/2016.

In this date, A1 do X, then A2 do X, then A3 do X.....then A7 do X and finnish.
If A1 do X for 2 days, A2 do X for n day, A3 do X for 0 day.....

Because we don't know how long each nation do action X
=> it is an ambiguity to know the