Which of the following is an example of teaching stimulus generalization?

The focus of stimulus generalization is to ensure that a learned behavior can occur across different contexts, settings, or stimuli rather than being tied to a specific situation. In this case, teaching the student to say "Hello" to different peers represents an instance of stimulus generalization because it encourages the student to use the same verbal behavior in various social contexts with different individuals.

This approach helps the student apply the same social skill across multiple interactions, reflecting the broader application of that skill beyond a controlled or specific situation. By practicing greeting different peers, the student learns that the appropriate response to social encounters is versatile and not limited to just one person or scenario.

The other choices, while they involve learning and language skills, do not primarily focus on transferring a behavior across different contexts in the same way. For instance, teaching synonyms focuses on vocabulary expansion rather than how to use greetings in various social situations. Teaching a phrase in different settings may apply to behavior but may not specifically show the generalization to different people. Teaching sentence variations is centered on writing skills, which does not emphasize applying a social behavior across different social interactions.