Which of the following most accurately describes the method of reasoning employed in the argument?

　　 Arguing that a circumstance is not a precondition for a phenomenon on the grounds that the phenomenon sometimes occurs where the circumstance is not present

　　 Arguing that a circumstance is a cause of a phenomenon on the grounds that the phenomenon has not occurred where the circumstance is not present

　　 Arguing that a particular thing cannot have caused a phenomenon because that thing was not present before the phenomenon occurred

　　 Attempting to establish a claim by arguing that the denial of the claim is inconsistent with the observed facts

　　 Attempting to establish that certain circumstances that would have had to occur for a particular explanation to be correct could not have occurred

　　7. Excavations at a Mayan site have uncovered jewelry workshops located some distance from the center of the site on roads radiating outward from the center. Since the nobility lived only in the area of the center, archaeologists conclude that these workshops made jewelry, not for the nobility, but for a middle class that must have been prosperous enough to afford it.

　　The archaeologists argument assumes which of the following about the artisans who worked in the workshops

　　 They were themselves prosperous members of a middle class.

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