Which of the Following Examples Reflects a Symptom of an Anxiety

Which of the following examples reflects a symptom of an anxiety disorder rather than normal anxiety?

A) The night before his final exam, Bill is unable to sleep because he is worried about doing well on the test.
B) For the past several weeks, Mavis has been unable to concentrate at work because she keeps thinking that something terrible might happen to her son at school, even though she knows that he's safe.
C) Seth is upset because his girlfriend told him she wants to start dating other guys, and he is afraid that she will break up with him.
D) Barbara has just found out that her company has been sold, and she is very worried that she might lose her job.