Critical Reasoning (CR) | Re: Eating beets significantly lowers the risk of cancer

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 didnot.
Which of the following, if true, most weakens the argument in the magazine article?
The question stem says that eating beets significantly lowers the risk of answer. This has been derived from a study which found that people who
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