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June 2007, Logical Reasoning 1, Question 5

The content provides an in-depth analysis of how to approach and solve a weaken question on the GRE, focusing on attacking the argument's assumptions by understanding its conclusion and evidence.
  • Identify the conclusion and evidence of the argument to understand its assumptions.
  • Recognize the two major assumptions in causal arguments: exclusivity of the cause and the absence of barriers to the cause's effect.
  • Evaluate answer choices by how they attack these assumptions to weaken the argument.
  • Answer choice B is identified as the correct answer because it challenges the timing assumption, suggesting the gases did not cause the warming.
  • Other answer choices are reviewed and dismissed for not effectively attacking the argument's assumptions.
Understanding Weaken Questions
Identifying Assumptions in Causal Arguments
Evaluating Answer Choices