Several Large-Scale Studies Have Examined Traits and Lifestyle Factors Associated

Multiple Choice

Several large-scale studies have examined traits and lifestyle factors associated with people who develop Alzheimer's disease and other forms of senility, and people who maintain good cognitive abilities into old age. These studies generally conclude that

A) rates of dementia and Alzheimer's occur independent of lifestyle.
B) biological factors contribute more strongly to memory loss with age than environment.
C) living a solitary and isolated life helps to prevent neuronal degeneration.
D) physical and mental activity may help to protect against memory loss.