Schaie's Longitudinal Study Began in 1956

Multiple Choice

Schaie's longitudinal study began in 1956.What was his study's findings regarding cognitive abilities?

A) Cognitive abilities decline as people age.
B) Cognitive abilities differ because of genetic reasons.
C) People born earlier had better cognitive abilities than those born later.
D) The cognitive abilities of the different cohorts were based on their experiences in education and society in general.