Stimulus
Yang: Yeast has long been known to be a leaven, that is, a substance used in baking to make breads rise. Since biblical evidence ties the use of leavens to events dating back to 1200 B.C., we to be a leaven at that time.
Campisi: I find your inference unconvincing; several leavens other than yeast could have 1200 B.C.
What this question is testing
Your task
Describe how the argument proceeds — the technique it uses to reach its conclusion.
Common trap
Answers that describe a method the argument doesn't actually use.
Winning move
Track the role each statement plays, then match that to the choice describing the same moves.
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