How Does the Rate of Neurocognitive Disorder Due to Alzheimer's

How does the rate of neurocognitive disorder due to Alzheimer's disease differ when comparing different demographic groups?

A) No differences in the rate of the disorder by race or gender have been noted.
B) Males and certain racial groups appear to have lower rates of the disorder.
C) No differences are found in the rate of neurocognitive disorder due to Alzheimer's disease by race, but women appear to have a slightly higher rate of the disorder than men.
D) No differences are found in the rate of neurocognitive disorder due to Alzheimer's disease by gender, but some racial differences have been noted.