Early studies of adult intelligence led researchers to the conclusion that intelligence in adulthood: A. peaks at about age 18, remains stable until the mid-20s, and declines thereafter. B. increases slowly during the 20s and early 30s, and declines thereafter. C. is plastic and variable, and may either increase or decrease. D. is most significantly affected by experience, such as war traumas

Early studies of adult intelligence led researchers to the conclusion that intelligence in adulthood:

A. peaks at about age 18, remains stable until the mid-20s, and declines thereafter.
B. increases slowly during the 20s and early 30s, and declines thereafter.
C. is plastic and variable, and may either increase or decrease.
D. is most significantly affected by experience, such as war traumas

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