'Since the museum introduced free entry, visitor numbers have doubled. Therefore free entry caused the increase.' Which statement would most weaken this argument?

Answer and explanation

Correct answer: D. A major exhibition with national attention opened that month

  1. Step 1: The argument assumes that free entry is the only change. Step 2. A separate event that could explain the rise offers another cause. Answer: A major exhibition opened in the same month. Why not the others: Advertising supports the argument, and opening hours and the cafe do not give another cause for doubling.

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