The psychologist John Watson is associated with the school of psychology and argued that psychology must concern itself only with .

Behavioral and behavior.

Explanation:

Psychology is the field of science that mainly deals with study of the mind and behavior of an individual. Both the external and internal factors plays an important role in the mental state of the organisms.

John Watson was the famous psychologists that explain the theory of Behavioral school of psychology. The stimulus response behavior is studied by the Watson. He explains that environment also plays an important role to learn the particular behavior.  He had a strong belief and investigate that itself can be concerned by the behavior.

Thus, the answer is behavioral and behavior.

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