(C) says, "Inscription-bearing clay envelopes containing tokens discovered in modern Iraq have provided Schmandt-Besserat with the evidence required to resolve the puzzlement of archaeologists over the sudden appearance of sophisticated crafts."
The problem with (C) is that we know that archaeologists are puzzled, but they're only puzzled about the fact that ancient clay tablets contained numerous abstract symbols even though they're very old. The archaeologists are not puzzled about the appearance of sophisticated crafts. Additionally, the passage's author never states whether or not Schmandt-Basserat is correct. Thus, we can get rid of (C).
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