Which of the Following Statements Is True with Regard to the Rate

Which of the following statements is true with regard to the rate of Alzheimer's disease dementia for different demographic groups?

A) Males and all non-Caucasian racial groups appear to have lower rates of the disorder.
B) No differences are found in the rate of Alzheimer's disease dementia by gender, but some racial differences have been noted.
C) Roughly, the same rate of Alzheimer's disease dementia is found among ethnic groups, but women appear to have a slightly higher rate of the disorder than men.
D) No differences in the rate of the disorder by race or gender have been noted.