According to Craske & Barlow (1988), All the Evidence Points

According to Craske & Barlow (1988) , all the evidence points to what conclusion about agoraphobic avoidance behaviour?

A) It is conceptually unrelated to panic disorder; it is a coincidence that they often occur together.
B) It is similar to the behaviour of people with generalized anxiety disorder.
C) It is a way of coping with unexpected panic attacks.
D) It is a principle cause of panic disorder.