As a child, Rahul was bitten by a spider and thereafter developed an intense phobia of them. His mother, in an effort to treat Rahul's phobia, eventually took him to a psychologist who gradually exposed him to spiders. After a few sessions of having nonthreatening experiences with spiders, Rahul was able to overcome his phobia. In the context of classical conditioning, this is an example of
a. stimulus generalization.b. habituation.c. extinction.d. backward conditioning.