When Boys Reach Puberty, They Usually Develop Greater Muscle Mass

When boys reach puberty, they usually develop greater muscle mass, whereas when girls reach puberty they typically have an increase in body fat percentage. These findings are likely related to which of the following?

A) Girls are more likely to develop eating disorders than boys.
B) Eating disorders are more likely to occur after reaching puberty.
C) Eating disorders occur most frequently in boys who were skinny during childhood.
D) Both a and b.