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Eating beets significantly lowers the risk of cancer, according to an article in a nutritional magazine. The article refers to a study that found that people who consumed one or more beets per day were half as likely to be diagnosed with the disease as people who did not. Which of the following, if true, most weakens the argument in the magazine article?
Answer: E
Explantion:
Correct Answer: E
The article draws a conclusion on the basis of the findings of a single study. However, the link between eating beets and cancer prevention cannot be verified without ruling out other variables. If the participants who ate beets were also similar in another way that distinguished them from the group that did not, it would become impossible to prove that beets - and not the other factor - were responsible for reducing the risk of cancer on the basis of this study alone. A. The effectiveness of flax seed oil in reducing the risk of cancer has no bearing on the effectiveness of beets in doing so. This answer is off topic. B. This answer strengthens, rather than weakens, the argument. If the subjects ate only beets and no other vegetables, there is more evidence for the fact that beets – and no other vegetable – were responsible for reducing the risk of cancer. C. The study would be more convincing if it had been conducted in more than one city. However, this fact alone does not do the most to weaken the argument. D. This other experiment is about the role of beets in the recovery rates of cancer patients, rather than in the risk of diagnosis. Therefore, it does not weaken the conclusion of the article, which focuses on cancer prevention, not recovery.E. Because study participants who ate beets were also more likely to exercise regularly than those who did not eat beets, it is impossible to determine whether beets or regular exercise were more influential in preventing cancer. This is the correct answer.
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