in the one-group pre-test post-test design which of the following threats to internal validity is not controlled

This is a negative reaction to food that doesn’t involve the immune system

Those with high self-esteem generally live a more fulfilling life and have better relationships. select the best answer from the choices provided. t f

“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?