Anxiety has four levels: mild, moderate, severe, and panic. Each level causes both physiological and emotional changes in the person. Which statement is appropriate for the severe level? A. A. It can help the individual focus attention to learn, solve problems, think, protect oneself, and engage in goal-directed activity. B. A. In this level, the person becomes nervous or agitated, and has difficulty concentrating independently, however, can still process information, solve problems, and learn new things with assistance from others. C. A. The person tends to focus on a specific detail and not to think about anything else, and all behaviors are aimed at relieving anxiety. D. A. It is associated with awe, dread, and terror, and the person may feel that he or she is unable to do things even with direction.