the argument is that because we know what temp/pressure it takes to create a fullereness in the lab, and that fullereness is found naturally, we can conclude that similar temp/pressure must have happened at some point on earth to form fullereness.
option D is the only one that weakens this because, if the fullereness found naturally is a of a different structural makeup, it means that we no longer know the temperature/pressure it takes to form natural fullereness, and thus can't use it as a test case for geologists.
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Source: Beat The GMAT — Critical Reasoning |
