Which of the following statements about the widespread belief that intelligence inevitably declines in middle and late adulthood as the brain deteriorates is true?

A) Many early cross-sectional studies showed an age-related increase in cognitive functioning.
B) Cohort effects do not appear to affect the appearance of age-related intelligence declines in middle adulthood.
C) Widespread testing of college students and soldiers in the 1920s revealed an age-related increase in intelligence in middle adulthood.
D) When adults are followed longitudinally, their verbal scores rise during early adulthood and decline gradually during middle adulthood.

C