Hidden GMOs

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In a world in which hunger is a problem, genetically modified crops represent a substantial agricultural advance, because they are more resistant to weeds and disease, they produce bigger yields of crops, and they have a longer shelf life. Moreover, although there were concerns about potential human health hazards initially, genetically modified crops have been sold commercially for almost twenty years now; with lots of attention on them, if they created short- or long-term health problems, we would know about it by now.

Which of the following, if true, most weakens the argument stated above?