Alvin, 17, and Gayle, 16, are a married couple who have recently moved from the rural South for better jobs. A few months before relocating, Gayle had to stop working because she began to collapse, sometimes with dizziness but often without warning. A medical evaluation found no organic problems. She also reports a loss of vision and movement, while maintaining the ability to hear and understand what is happening around her. The MOST appropriate provisional diagnosis is:

a) Conversion Disorder
b) Generalized Anxiety Disorder
c) Panic Disorder
d) Somatization Disorder