With Regard to Race/ethnicity and Socioeconomic Status (SES) in Prevalence

With regard to race/ethnicity and socioeconomic status (SES) in prevalence patterns in autism spectrum disorder:

A) There are no known differences in prevalence for either race/ethnicity or SES
B) There are no known differences for race/ethnicity, but there are higher rates of autistic disorder in lower SES groups
C) There are no known differences for SES, but there are higher rates of autistic disorder in Caucasian Americans
D) African Americans living in poverty show the highest rates of autistic disorder