Answer :
The additional information that would contribute to the validity of the ideas presented in this article is, a survey of young athletes will to try thermometer pills.
Answer: Option D.
Explanation:
Validity of any article or passage refers to its soundness or the quality of being logical. In the above mentioned passage, the author can contribute to the validity of the article by surveying the young athletes will to try thermometer pills.
The author have very well described the causes and effects of heart stroke, description about the thermometer pills, its price, and what the capsule does to the body. But by adding the survey of the young athletes regarding the pills, the other athletes will also be encouraged to use this pill and they will also get a fair review of whether or not to consume the pill.