Final answer:
Genetically modified crops being less expensive to cultivate is not considered a problem; it's a potential benefit. The other options listed are potential risks associated with the use of GMOs(option E).
Step-by-step explanation:
The question pertains to understanding the potential problems caused by GMOs.
Of the listed options, the option that is not a potential problem is 'Genetically modified crops may turn out to be less expensive to cultivate than unmodified ones' (Option E).
This statement is generally considered a potential benefit rather than a problem. Contrary to the points, GMOs may pose environmental risks such as potentially killing ecologically valuable organisms, causing certain organisms to grow uncontrollably and become resistant to pesticides, and reducing genetic diversity in crop plants, which in turn can make them more susceptible to pests. However, it's also recognized that GMOs have been vigorously opposed for a variety of reasons and that this opposition has decreased since many cited problems have not manifested with the widespread use of GMOs over the past fifteen years.