Sales of umbrellas rose last month. The store manager concludes that the new advertising campaign caused the rise. Which, if true, most WEAKENS the conclusion?

  1. Umbrella prices did not change.
  2. The store sells many products.
  3. The advertisements were shown on television.
  4. Last month had the heaviest rainfall in ten years.
Answer

D) Last month had the heaviest rainfall in ten years.

An alternative cause (rain) explains the rise. Advanced Verbal (GRE, GMAT, SAT) · Critical reasoning

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