What treatment is Maxwell's psychiatrist most likely to provide for his bipolar disorder?

Derek's intelligence quotient (IQ) of 100

A) expresses the ratio of his chronological age to his mental age. B) indicates the extent to which his raw score deviates from the typical performance of same-age individuals. C) represents the number of test items he left unanswered as compared to those items he answered correctly. D) is based on the average score from the same test taken at three different ages.

The ability to engage in abstract reasoning about hypothetical events that are not directly experienced develops in which of Piaget's stages of cognitive development?

A) Concrete operations B) Formal operations C) Preoperational D) Sensorimotor