One Hypothesis to Explain the Observed Differences in the Rate

One hypothesis to explain the observed differences in the rate of Alzheimer's type dementia for individuals of varying educational level is that

A) the abilities acquired through formal education help compensate for some of the deficits of the disorder.
B) the type of mental activity associated with formal education places an additional burden on the brain that makes symptoms worse once a person has the disorder.
C) knowledge acquired through formal education helps one avoid exposure to environmental stimuli that might influence the disorder.
D) the type of work that most college graduates pursue is less likely to expose the individual to the stressors associated with the disorder.