According to Research, What Cultural Shift Has Been Directly Associated

According to research, what cultural shift has been directly associated with changing rates of eating disorders?

A) rising levels of intelligence over the 20th century (i.e., the Flynn effect)
B) transformations in the self-concept from interdependence to independence
C) changes in norms about the ideal body as reflected in cultural products
D) rising rates of migration from societies with different norms around food
E) changes in gendered norms about appropriate social behavior