Argument: A company says its new fertiliser raised wheat yields, because farms using it produced 20% more wheat this year. Which of the following, if true, most strengthens the argument?
Correct answer C. Nearby farms that did not use it, with the same weather and soil, saw no increase in yield
Explanation
If similar farms without the fertiliser saw no rise, good weather or soil cannot explain the increase, which supports the fertiliser. The rainfall option offers another cause and weakens the claim.
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