How would the inclusion of this piece of evidence affect the author's credibility? According to our study of more than 400 high schools, giving students more freedom to choose their own classes improves performance on standardized tests and college entrance exams.

A. It would decrease the author's credibility by showing that the author relied only on her own experience to draw conclusions.

B. It would increase the author's credibility by showing that the author included relevant evidence for her claim.

C. It would increase the author's credibility by showing that the author analyzed a large amount of information to come to her conclusion.

D. It would decrease the author's credibility by showing that the author was more interested in student outcomes than in making high school enjoyable.​