Which of the Following Best Demonstrates How Observational Learning May

Which of the following best demonstrates how observational learning may account for the creation of an anxiety disorder?

A) a phobic's fear of dogs is maintained because he avoids dogs.
B) a person with panic disorder misinterprets her increased heart rate as a signal that she is about to have a heart attack.
C) a person with a genetic predisposition develops a phobia of natural weather phenomenon after seeing graphic pictures of people traumatized by a tornado.
D) a person has a bad fall from a tree as a child and learns to associate the fear evoked from this incident with all heights.