It is now clear that the ancient Egyptians were the first society to produce alcoholic beverages. It had been thought that the ancient Babylonians were the first; they had mastered the process of fermentation for making wine as early as 1500 B.C. However, archaeologists have discovered an Egyptian cup dating from 2000 whose chemical residue reveals that it contained a form of alcoholic beer.
What this question is testing
The Argument
The author finds an Egyptian cup from 2000 B.C. with beer residue and a picture of a brewery on it. That is older than the Babylonian wine evidence from 1500 B.C. So, the author concludes, Egyptians were the first society to produce alcoholic beverages.
Evaluate
The leap is from "oldest evidence we have so far" to "first ever." Those are not the same.
It is like saying, Maybe — but maybe earlier dinosaurs existed and we just have not found their fossils yet, or those fossils were destroyed by time.
Goal
The right answer should call out this gap: the earliest known instance is not necessarily the first instance.
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