If a dog that has been classically conditioned to salivate when shown a square does NOT salivate when shown a triangle,what does the dog's behaviour illustrate

A)  extinction
B)  stimulus discrimination 
C)  stimulus generalization
D)  first-order conditioning

Stimulus Discrimination

The learned ability to differentiate between a conditioned stimulus and other stimuli that have not been paired with an unconditioned stimulus.

Classically Conditioned

The process by which an individual learns to associate a neutral stimulus with a biologically potent stimulus, producing a response to the neutral stimulus.

Square

A four-sided polygon with all sides of equal length and all angles measuring 90 degrees.