It has been suggested that chronic anxiety is the result of . 1. second-order conditioning and stimulus generalization 2. repeated pairing of a common stimulus with an unpleasant response 3. the occurrence of one predictable negative event 4. repeated exposure to aversive stimuli that are unpredictable and random

4.

Explanation:

Chronic Anxiety is a disorder that is characterized by symptoms such as stress that's out of proportion to the impact of the event, constant worrying, restlessness, hypervigilance, irritability, racing or unwanted thoughts, fatigue, nausea, palpitations, or even trembling. It has been suggested that chronic anxiety is the result of repeated exposure to stimuli that are unpredictable and random. This unpredictability makes it hard to adapt to it and know how to react, thus causing this constant anxiety.