In Her Review of the Literature on Sports Participation and Grades

In her review of the literature on sports participation and grades, Broh found that previous research

A) failed to examine the impact of sports participation on grades.
B) showed that high school athletes got lower grades, on average, than non-athletes.
C) showed that students who participated in non-sports extracurricular activities got higher grades than other students.
D) had not adequately examined theoretical explanations of how sports participation affects grades.