Which Statement Best Summarizes the Research Findings of Arthur Jensen

Which statement best summarizes the research findings of Arthur Jensen regarding racial differences in intelligence?

A) Level II abilities show more heritability than Level I abilities.
B) Performance on Level II tasks tended to decline with age, whereas performance on Level I tasks tended to improve with age.
C) Level I tasks were performed equally well by children from all races, ethnic groups, and social classes.
D) Middle-class and white children outperformed lower-income and African-American children on Level I tasks, but not on Level II tasks.