Q: 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?

• 1
  Another study found that people who consumed one tablespoon of flax seed oil per day were more than four times less likely to be diagnosed with cancer
• 2
  Participants in the study reported consuming no vegetables other than beets.
• 3
  In another experiment, cancer patients who ate one or more beets per day were no more likely to recover than those who ate no beets.
• 4
  The participants in the study who ate beets were more likely to exercise regularly than those who did not eat beets.