All the following are mental or physical benefits of exercise expect?
a. better quality of sleep
b. increased stress
c. improved mood
d. higher self esteem

“an abused child's thoughts occasionally drift to other, less anxiety-arousing topics; this anxiety reduction thus serves to strengthen 'other' thoughts, while weakening the thoughts about abuse.” a psychologist with which theoretical background would be most likely to offer this quotation as an explanation for the development of dissociative disorders?