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TSA 2013 · Question 33 · Weakening Arguments

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'Organic food is no healthier than other produce, scientists claim' was the headline in an article published in 2009 in The Independent. It reported that a comprehensive review of 50 years of evidence showed no appreciable difference in nutrient levels between organic and conventional farm produce. If the review is correct, shoppers will think twice about buying organic food, especially if the price difference remains significant. Only if people really do receive some health benefit in return for the extra money will the current upward trend in organic sales continue.

Which one of the following presents the strongest challenge to the above argument?