Carly Used to Get Very Anxious in the Waiting Room

Multiple Choice

Carly used to get very anxious in the waiting room at her doctor's office because it was associated with the pain of having blood drawn.Recently,Carly's doctor retired,and a new doctor took over his office.Carly's new doctor uses a technique that is virtually painless,and the sight of the waiting room is no longer associated with pain.Consequently,Carly finds her anxiety in the waiting room has disappeared.Which classical conditioning process does this illustrate

A)  avoidance 
B)  spontaneous recovery 
C)  extinction 
D)  higher-order conditioning