Of the Following Best Describes the Results of Research Examining

of the following best describes the results of research examining the relationships among intentions to be active, subjective norm, perceived control, and youth activity levels?

A) Students' intentions to be active influence their perceptions of control and the subjective norm, which in turn influence their physical activity levels.
B) Students' intentions to be active, perceptions of control, and the subjective norm all directly influence students' physical activity levels.
C) Students' intentions to be active, perceptions of control, and the subjective norm do not influence their physical activity levels.
D) Students' perceptions of control and the subjective norm positively affect their intentions to be active, which in turn influence their physical activity levels.