Of the Following Best Describes the Results of Research About

of the following best describes the results of research about the impact of parents on youth physical activity?

A) Parental role modeling, involvement, support, and encouragement have all been found to have a strong impact on youth physical activity levels.
B) The influence of parental role modeling and involvement is unclear, but parental support and encouragement can positively affect youth activity levels.
C) The influence of parental support and encouragement is unclear, but parental role modeling and involvement can positively affect youth activity levels.
D) Parental role modeling, involvement, support, and encouragement have no impact on youth activity levels.