As she walked through her neighborhood, Jodie, a 6 year old girl, frequently saw a large brown dog. She repeatedly walked to the dog to pet it, but as her hand approached the animal, it barked and bit her. The bite was painful and caused her to cry. Now Jodie cries when she sees dogs of any color or size. Jodie now cries when she sees any dog, big or small, brown or black, etc. This illustrates which of the following?
a. generalization
b. discrimination
c. extinction
d. spontaneous recovery