A behavior is more likely to occur in the presence of stimuli that are more similar to the discriminative stimulus than it is in the presence of stimuli that are less similar to the discriminative stimulus. This is called a.

generalization gradient

Explanation:

generalization gradient is a graph marking the similarity or difference between two stimuli versus the similarity or difference in their elicited responses.

Generalization gradient

Explanation:

In psychology, a generalization gradient refers to the tendency to generalize a behavior when similar stimuli are presented, in other words it refers to the tendency that a behavior is more likely to occur in presence of stimuli that are more similar to the discriminative stimulus (the one that generates the behavior) than in presence of stimulus that are very dissimilar to the discriminative stimulus.  

Therefore, this is called a generalization gradient.

the answer is d. amendments.