The correct answer is the fourth option a fear of heights restricts Alice's enrollment to classes that meet on the first floor.
Systematic desensitization refers to a type of behavioral therapy that works to extinguish fears or phobia by gradually increasing an individual's exposure to the phobia or fear. An individual with a fear or phobia is made to feel safe and taught relaxation techniques when he or she is gradually exposed to the fear or phobia. Ultimately, through systematic desensitization, people learn to stop having a fearful response to stimuli they were previously afraid of.
