Critical Reasoning

HI I'm unable to get this CR

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.