Final answer:
The humanistic model of abnormality, associated with Abraham Maslow and Carl Rogers, focuses on individual free will and self-actualization which influences behavior.
Step-by-step explanation:
Someone who studies the humanistic model of abnormality focuses on how values and choices affect behavior. Humanistic psychologists such as Abraham Maslow and Carl Rogers emphasized free will and self-determination, with a belief that every individual has an innate desire to achieve self-actualization. This perspective looks at individuals as inherently good and as having the potential to achieve their best selves. In contrast, the biological approach looks at genetic and physiological factors in personality, the psychodynamic approach focuses on unconscious forces and early childhood experiences, and the existential approach deals with concepts such as meaning and choice.
Of the options provided (a) Biological, (b) Psychodynamic, (c) Humanistic, and (d) Existential, the correct answer to the question is (c) Humanistic.