Amy has been conditioned to blink using air puffs and a 1000 MHz tone. The experimenter finds that the conditioned response also occurs for 750 MHz tones, 850 MHz tones, 1250 MHz tones and 1500 MHz tones. This is an example of:

This is an example of stimulus generalization.

Explanation:

Stimulus generalization happens when a stimulus, similar to the conditioned one, causes the same behavior or response as the conditioned stimulus. In this case, the conditioned stimulus was the air puff and a 1000 MHz tone, but Amy shows the same behavior when the tone is also in other frequencies since the stimulus was generalized.

u idek                                                                                                                                               /

i think it is the third one.