Cynthia's family has a history of early onset alzheimer's which has affected her great-aunt and maternal grandmother. although cynthia has shown no signs of cognitive decline, she decided to participate in a study to examine ongoing cognitive health and determine possible factors correlated to various forms of dementia. what is the best reason for participation in this study?
a) cynthia wants to identify any change in her cognitive abilities as early as possible.
b) participation in this study will give her greater access to drugs that would cure dementia.
c) cynthia wants to track all the various medical conditions that are being measured in the study.
d) participation in the study will contribute to a better understanding of factors that may contribute to dementia.