bb wrote:
ttram wrote:
msday86 wrote:
I think the assumption is that the increase in salt level is constant throughout time. So, I think A is the answer. If the increase in level over the last 100 years in unusually high, then that invalidates themethod.
I agree with you that A is right. However, what do you think aboutE?
After re-reading choice E several times (which I may not have done on the real GMAT), it seems to be irrelevant.
The argument says to take the difference between salt levels today and 100 years
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