The answer is E.

The pharmaceutical representative argues that OsteoKid will contribute to children’s long-term health because it contains vitamin D, which is important for calcium absorption and skeletal development.
The pediatric nutritionist does not deny that vitamin D is beneficial. Instead, the nutritionist points out that OsteoKid also contains significant quantities of high-fructose corn syrup, which is associated with metabolic disruption and weight gain in children. So, the nutritionist’s response weakens the representative’s conclusion by introducing an additional health-related concern.

Option A:
This option says that the nutritionist disputes the representative’s assertion that vitamin D plays a role in calcium absorption. This is not what happens. The nutritionist never challenges the claim about vitamin D. The nutritionist may fully agree that vitamin D helps with calcium absorption and skeletal development. The problem is that OsteoKid contains another ingredient that may harm children’s health. So, this option is incorrect because the nutritionist does not attack the vitamin D claim.

Option B:
This option says that the representative’s evidence, when fully analyzed, supports the opposite conclusion. This is not accurate. The representative’s evidence is about vitamin D. That evidence still supports the idea that vitamin D can benefit children’s skeletal development. The nutritionist does not reinterpret that evidence to show the opposite. Instead, the nutritionist introduces a separate piece of evidence about high-fructose corn syrup. So, this option is incorrect because the nutritionist is not using the representative’s own evidence against the representative.

Option C:
This option says that supplement manufacturers routinely prioritize commercial interests over nutritional integrity. The nutritionist does not make any claim about the motives of supplement manufacturers. The response is focused only on OsteoKid’s ingredients and possible health effects. There is no discussion of whether the company is greedy, careless, profit-driven, or commercially motivated. So, this option is incorrect because it introduces a motive-based claim that is not present in the argument.

Option D:
This option says that the nutritionist questions whether high-fructose corn syrup is more harmful to children than to adults. The nutritionist does not compare children and adults. The nutritionist’s point is simply that routine intake of high-fructose corn syrup is associated with metabolic disruption and weight gain in children. Whether it is more harmful to children than to adults is irrelevant to the response. So, this option is incorrect because it introduces a comparison that the nutritionist never makes.

Option E:
This option says that the nutritionist introduces additional evidence that undermines the conclusion reached by the representative. This is exactly what happens. The representative concludes that giving children OsteoKid regularly will contribute to their long-term health. The nutritionist responds by pointing out that OsteoKid contains significant quantities of high-fructose corn syrup, and that regular intake of this ingredient is associated with negative health effects in children. This additional evidence weakens the broad conclusion that OsteoKid is good for children’s long-term health. Even if the vitamin D is beneficial, the high-fructose corn syrup may create health risks. Therefore, this is the correct answer.