Since we have a weakening question, let's begin by paraphrasing the argument:
What we learned in the lab about fullerenes will teach us about fullerenes outside of the lab.
Next, let's identify the author's assumption: laboratory fullerenes are substantially the same as real world fullerenes.
Finally, let's make our prediction. To weaken an argument, predict an answer that attacks the author's assumption. Here:
Lab fullerenes are significantly different than real world fullerenes.
Armed with our prediction, we attack the choices, looking for a match:
a) no distinction - eliminate.
b) no distinction - eliminate.
c) no distinction - eliminate.
d) a difference! If the naturally occurring fullerenes are unique, then what we learned in the lab won't teach us anything about the natural world. Choose (d)!
Since we found a match for our prediction, we should confidently choose (d) and move on. However, let's step into "review mode" and take a quick peek at (e):
e) no distinction - eliminate.
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