I believe the answer is c) situational variables
Answer:
Answer is clinical psychology.
Explanation:
Clinical psychology involves the treatment of mental illness and behavioral difficulties. The psychologist will help the client in identifying emotional or mental problems. This is done through interviews, where he diagnose existing or potential disorders. The psychologist made use of talk therapy only for treatment .
John D Rockefeller would be the answer you're looking for :)
An externality associated with a market can produce negative costs and positive benefits, both in production and consumption.
