When Longitudinal Studies Were Used to Understand Cognitive Functioning, It

Multiple Choice

When longitudinal studies were used to understand cognitive functioning, it was found that:

A) Global IQ tends to rise until the mid-50s and then gradually declines.
B) Global IQ tends to rise until the mid-30s and then declines sharply.
C) Global IQ remains constant throughout the entire lifespan.
D) Global IQ rises sharply until the mid-20s and then stabilizes.