Nicole's Mother Is Terribly Afraid of Snakes

Nicole's mother is terribly afraid of snakes. Although Nicole has never actually seen a snake, her mother has told her time and again to be careful and look for them when she is walking. Now Nicole has an intense fear of snakes and refuses to walk in the grass. This is an example of

A) vicarious conditioning of a phobia.
B) classical conditioning of a phobia.
C) operant conditioning of a phobia.
D) unconscious displacement of anxiety onto a phobic object.