Question: Dr. Martin studies adolescent anxiety. She is working to develop a reliable self-report measure that can distinguish between two different types of anxiety: generalized anxiety disorder and social anxiety disorder. Which of the following assumptions is Dr. Martin making about the nature of psychological disorders? a. Psychological disorders are categorical. b. Psychological disorders are endogenous. c. Psychological disorders have a physiological cause. d. Psychological disorders are different from physical disorders in important ways.