When Researchers Followed a Large,representative Sample of U

When researchers followed a large,representative sample of U.S.youths from ages 9 to 17,they found that __________.

A) two-thirds of all students receive physical education in high school
B) daily free-time physical activity declined with age, more so for girls than boys
C) a majority of participants engaged in regular exercise outside of school hours
D) half of all students experienced a daily physical education class in high school