A team of researchers hypothesizes that participation in extracurricular arts programs in middle school is associated with higher rates of academic engagement in high school, beyond the effects of family background.
Which finding, if true, would most strongly support the team's hypothesis?
- A
Many schools offer extracurricular arts programs.
- Bcheck_circle
Among students with similar family backgrounds, those who participated in middle school arts programs reported higher rates of academic engagement four years later than those who did not.
- C
Some students participate in multiple extracurricular activities.
- D
Family background can be measured in several ways.
Explanation
A controls for family background and isolates participation as the variable, exactly as the hypothesis specifies. B, C, and D are general or tangential.