Cognitive psychotherapy is based upon the assumption that psychological problems are essentially caused by: Question 9 options:

Faulty or maladaptive thinking.

Explanation:

Cognitive psychotherapy may be defined as a psychotherapy that connects the feeling, behavior and thoughts if an individual. The cognitive psychotherapy was first developed by Aaron T. Beck.

The cognitive psychotherapy was based on the facts that maladaptive and faulty thinking are the main reason of this therapy. The internal reality of an individual can be understood by this psycotherapy.

Thus, the answer is faulty or maladaptive thinking.