The correct answer is A. She would present the facts of the study in an academic, formal tone.
Explanation
An article is an academic text wrote in formal tone that presents a hypothesis supported by different arguments and evidence that give it credibility and acceptance. According to the above, the educator who has a hypothesis that proposes a "link between later start times for high school students being linked to better grades" must provide credible and reliable evidence that allows readers to believe in her proposal, therefore above, the best way to present this text would be A. She would present the facts of the study in an academic, formal tone, to give it credibility.