What Is the Primary Reason Older Cohorts Tend to Score

Multiple Choice

What is the primary reason older cohorts tend to score lower on standardized tests than younger cohorts?

A) After age 50,people begin to show signs of dementia.
B) The majority of older adults are functionally and technologically illiterate.
C) As result of better diets and biological evolution,younger people are more intelligent than older adults.
D) Levels of formal education vary across generations;older adults are likely to have fewer years of schooling.