Final answer:
Little Albert's fear of anything resembling a white rat is an example of stimulus generalization.
Step-by-step explanation:
The correct answer is a. Stimulus generalization. Little Albert's fear of anything resembling a white rat demonstrates stimulus generalization. After being conditioned to fear the white rat, Little Albert began to show fear responses to other furry white objects, such as a rabbit, a furry coat, and even a Santa Claus mask.