Option c is correct. David is concerned about the biological aspects of having a psychological disorder.
Generally speaking, a psychological disorder is characterized by distressing, troubling, and/or unusual thoughts, feelings, and behaviors. Psychopathology is the study of psychological disorders, in addition to their signs, etiologies (i.e., root causes), and therapies. Psychopathology is a term frequently used to describe a psychological disorder in its manifestation.
Although it can be difficult to come to an agreement, it is imperative that mental health professionals agree on the kinds of thoughts, feelings, and behaviors that are abnormal in the sense that they indicate the presence of psychopathology. It is simple to classify particular recurring patterns of conduct and inner experience as distressing, impairing, or abnormal, which more overtly point to a psychological disorder.
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