As Discussed in Your Textbook, Which of the Following Is/are

As discussed in your textbook, which of the following is/are TRUE regarding eating disorders?

A) Cultural norms of beauty are thought to contribute the development of eating disorders in North America.
B) Research has demonstrated that individuals with anorexia describe their parents as disapproving with very high standards.
C) Research has demonstrated that individuals with bulimia tend to be depressed, anxious, and lack a stable sense of self-identity.
D) Genetic factors create a predisposition toward eating disorders.
E) All of these.