A study found that silicon dioxide is a form of silicon that is easily absorbed by plants. By using silicon dioxide to improve the soil, plants can precipitate small particles called "plant stones". The silicon contained in the particles can slow down insects Due to the development of grains, the texture of granular stones can also wear insect mouthparts, thereby reducing the degree of plant pests. Therefore, relevant researchers have suggested that such silicon elements can be added to soils in areas where crops are often affected by insects. Which of the following, if true, would best refute the above suggestions? ['Insect resistance and drug sensitivity are the same in all regions.', 'Insect-affected areas are generally deficient in silicon.', 'Silicon in crops can affect the physical development of consumers.', 'Silicon-rich crops taste better than ordinary crops.']