Recently,there Has Been an Increased Interest in Physical Activity,particularly in Children,because

Recently,there has been an increased interest in physical activity,particularly in children,because

A) of brain-based learning research.
B) there is an obesity epidemic in the United States.
C) studies are showing a link between physical activity and academic performance.
D) all of the choices are correct
E) of brain-based learning research and because there is an obesity epidemic in the United States only.