Answer choice (E) is incorrect because it does not prevent the author from drawing their conclusion.
The author tells us that, originally, nearly 60% of the children exhibited behaviour problems and that, after the change in diet, only 30% of the children exhibited behaviour problems. The author then uses this information to conclude that food additives "can contribute to behaviour problems" in hyperactive children.
While answer choice (E) could be true in that some children exhibit more frequent behaviour problems after the change in diet, the author does not conclude that food additives absolutely cause behavioural problems. Rather, the author says that additives can contribute to behaviour problems, suggesting that there are other factors at play. Therefore, the fact that some children exhibited more frequent behavioural problems after the change in diet does not prevent the author from properly drawing their conclusion.
Hope this helps! Please let us know if you have any further questions.
AllisonJJune 1, 2021
This is great but could explain why B is right as well
Emil-KunkinAugust 18, 2024
As we read the passage, we see a major error in the experimental design: we have an experiment with no control group. That is, we have a change and conclude that a result was a result of that change, but we dont have a control group. that is, we have no idea if the result would have occurred even if the change had not. This is a perfect match for B
