This is a pretty silly argument, since we shouldn't have to think in science fiction terms for a CR. However, do pay attention to the word "prohibitively" in B. That doesn't just mean "very." It means too expensive to be done for the stated purpose. As in, people wouldn't do it. That makes B a definite weaken.
Also, keep in mind that a weaken will almost never disprove the argument. That isn't the goal. The right answer just has to make the conclusion less likely. If it turns out to be so expensive to make copper out of other elements that it would not be financially feasible as an industrial solution, then it seems much less sensible to say that there's no limit on the copper supply. B has done its job!
Also, keep in mind that a weaken will almost never disprove the argument. That isn't the goal. The right answer just has to make the conclusion less likely. If it turns out to be so expensive to make copper out of other elements that it would not be financially feasible as an industrial solution, then it seems much less sensible to say that there's no limit on the copper supply. B has done its job!
Statistics : Posted by DmitryFarber • on 04 Nov 2010, 23:02 • Replies 16 • Views 7544
