Which Statement MOST Accurately Describes the Results of the Seattle

Which statement MOST accurately describes the results of the Seattle Longitudinal Study?

A) Although there are individual differences, intellectual abilities generally decline substantially by age 65.
B) Although abilities dependent on processing speed clearly decline with age, most abilities do not decline substantially until age 80.
C) People in higher socioeconomic brackets are less likely to retain their intellectual abilities because of the high levels of stress typically associated with their careers.
D) Results were inconclusive because the researchers used a combination of methodologies.