What's the conclusion of the argument?
That we can use the natural fullerenes to learn about the earth's crust.
What the assumption?
Natural fullerenes = earth's crust. The argument assumes that there is a connection between these two things.
Predict the answer:
Since we're trying to weaken the conclusion, we need an answer choice that breaks the link between the the natural fullerenes and the earth's crust, that says we won't be able to use the natural fullerenes to learn about the earth's crust.
Answer choice is D is correct because it says that the natural fullerenes are of an unknown structure; hence, we might not be able to use them to learn about the earth's crust.
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