Separation Anxiety Disorder Is Best Illustrated by Which of the Following

Separation anxiety disorder is best illustrated by which of the following people?

A) Chuck, who is afraid he will be beaten by bullies at school.
B) Isabella, who worries that her father will die if she is not near him.
C) Harriet, who refuses to talk to her teachers or other adults other than her parents.
D) Thomas, who is fiercely independent of other children and his parents.