Question Type:
Strengthen
Stimulus Breakdown:
Premise: Many objects that have been used as currency were first used mainly for decoration.
Premise: Beads were originally used for decoration.
Conclusion: It is natural that beads were used as currency.
Answer Anticipation:
There are a couple of problems with this argument. First, we're told something about "many" objects, but how many is "many?" Is this a small percentage of objects used as currency, or a large percentage? In everyday language we often use "many" to mean a relatively large number, but it's a vague term.
Second, the argument relies to some extent on reversed logic. Even if "many" means a large percentage, if many objects that have been used as currency were first used as decorative objects, does the reverse have to be true? Does an object's use as decoration guarantee that it will be used as currency? Many people consider a deer head mounted on a wall to be a decorative object. Have you ever seen someone trying to buy groceries with one? (If you have, send me a message. I want to come hang out in your town some day, just for fun).
Correct answer:
(C)
Answer choice analysis:
(A) Reversal: Lets break this down. What secondary uses are we talking about? That's currency, I guess. What is the primary use? Decoration? So, this answer choice suggests that, because beads and gold were similarly used as currency, that caused one being used as decoration to lead to the other being used as decoration. This doesn't strengthen our argument. We have evidence that beads were used as decoration, and are trying to conclude from this evidence that they were used as currency.
(B) Too weak: This is better than choice (A). Choice (B) is suggesting that gold and beads being used as decoration might have caused the secondary use of one—currency—to be transferred to the other. But stating that this "can" happen isn't overly convincing. Let's keep our eyes open for a stronger answer.
(C) Correct. This tells us that an object used as decoration is likely to have the same derivative use—currency—as other objects used for decoration. Stating that something is likely provides more support than stating that it "can" happen.
(D) Out of Scope: We don't know if anything ceased to have its original use.
(E) Unhelpful comparison: Choice (E) could strengthen the argument if we could interpret it to mean, "the more an object is used for decoration, the more likely it is to valued as currency." To do this, we need to treat using an object for decoration as equivalent to using it "to represent value in general." That's a big stretch.
Takeaway/Pattern:
Principles tend to be stated in broad terms. To evaluate answers, we need to connect those broad terms to the actual language in the argument.
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