Which of the Following Statements Regarding Separation Anxiety Disorder (SAD)

Which of the following statements regarding Separation Anxiety Disorder (SAD) is true?

A) SAD is fairly common among prepubescent children but rare among adolescents.
B) Children and adolescents with SAD report different fears, depending on their level of development.
C) Most data indicate that SAD is a persistent disorder that usually develops into GAD or other anxiety problems.
D) Insecure attachment causes SAD