The general concept of arranging stimuli from mild to intense used in training is called:

• A. Hierarchy of Intensity
• B. Noise Gradient
• C. Intensity Scale
• D. Hierarchy

Answer: (D)

This is about using a hierarchy to arrange stimuli from easy to hard. That structured progression lets a dog build confidence and skill step by step—starting with simple cues and gradually increasing difficulty as mastery is shown. The term hierarchy fits because it describes an ordered ladder of difficulty used to guide training. Other options describe more specific labels or unrelated ideas, but they don’t capture the overall framework as clearly as hierarchy. In practice, you’d begin with basic cues in a calm setting, then add distractions, complexity, or stronger odors as the dog progresses along the ladder.