Which Is the Best Example of Agoraphobia

Which is the best example of agoraphobia?

A) Claude once had a panic attack in an elevator, but he never had another.
B) Karen is afraid of speaking to a large crowd, but does not mind being part of a large audience.
C) John has a persistent feeling of doom, but has not experienced any panic attacks so far.
D) Becky loves live jazz, but she always goes to the same small, dimly lit club in her neighborhood because she is afraid she will embarrass herself in an unfamiliar club.