Question:

Public health officials warn that air pollution increases the risk of respiratory disease. A recent drop in pollution levels coincided with a fall in new respiratory disease cases. Which of the following, if true, most strengthens the officials’ warning?

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To strengthen causal claims, look for evidence showing correlation or dose-response between cause and effect.
  • Respiratory disease cases usually peak in winter
  • The cities with the largest drop in pollution saw the largest fall in cases
  • The decline in cases was higher in rural areas than urban areas
  • There was a major health awareness campaign during the period
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The Correct Option is B

Solution and Explanation

Step 1: Identify strengthening evidence — Evidence that links larger pollution reductions to larger declines in disease strengthens causal link.
Step 2: Evaluate options — (b) provides direct supporting correlation. Others are irrelevant or weaken the causal link.
Step 3: Conclusion — Option (b) is correct.
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