Independent and Dependent Variables Robin Studied the Age at Which

Multiple Choice

Independent and Dependent Variables Robin studied the age at which Alzheimer's symptoms were first diagnosed in men and women who reported high or low mental activity and high or low socioeconomic status during their adult lives.Which were the subject variables in this ex post facto study?

A) age when Alzheimer symptoms were diagnosed and gender
B) gender and mental activity
C) mental activity and socioeconomic status
D) gender, mental activity, and socioeconomic status