Julian was always something of a "screwup" in school. His grades were poor, and he was suspended several times during high school for pulling pranks that his teachers didn't find funny

His parents were pleasantly surprised, however, when he went off to college. He enjoyed his biology classes so much that he decided to become a doctor and he began getting A's in all of his classes! His friends in college were the "intellectuals," and he spent many late nights at a local coffee house discussing politics and ethical issues related to the practice of medicine. After a successful first year, his parents were amazed to see him slip back into his slovenly habits and jokester ways when he returned home for the summer. Julian's behavior best illustrates the ideas of which personality theorist? A) Horney

B) Sullivan

C) Piaget

D) Skinner

E) Rotter

Answer: C) Piaget

Explanation: According to the Swiss psychologist Piaget, the cognitive development of children and adolescents takes place in several stages, and this is a theory that discusses the active participation of children in research as they acquire and develop their knowledge. It involves not only learning and gaining knowledge, but also how children and adolescents define intelligence. It is no stranger to the fact that during this development according to Piaget, children and adolescents resort to mischief, jokes, and manipulation like Julian. After that, it is possible to seriously engage in the acquisition of knowledge and research, to compare existing knowledge with that which has been upgraded. Discussions, conversations about ethics are all in the function of research and learning, as well as manipulation, challenges, misconceptions, and all together in the function of exploring the nature of intelligence. It is possible to re-enter the stage of outrageous, infamous jokes, which is again part of the whole of cognitive development according to Piaget. Knowledge and experience gained in the previous period are always upgraded and adapted to new knowledge.