Based on information in the article, which best describes the difference between the needs of teens and adults who have the gene variant, as revealed by the study? A. Teens require only moderate physical activities such as brisk walking, while adults require daily physical activities that induce a good sweat. B. Teens require more motivation to meet federal guidelines for daily exercise, while adults require less motivation to meet the federal guidelines. C. Teens require three hours of aerobic activity daily, while adults require four hours of aerobic activity daily. D. Teens require one hour of daily exercise to circumvent weight gain, while adults require three to four hours of daily exercise.