African Immigrants Living in London Neighborhoods Were More Likely to Be

African immigrants living in London neighborhoods were more likely to be diagnosed with schizophrenia if they lived in a neighborhood with a low proportion of African immigrants than if they lived in neighborhood with higher proportions of minorities (Boydell et al., 2001) . According to the text, what do these findings suggest?

A) Persons susceptible to schizophrenia experienced downward drift to these neighborhoods.
B) Certain ethnicities are more biologically vulnerable to schizophrenia than others.
C) The stress of social isolation because of minority status might contribute to the risk of schizophrenia.
D) Persons may self-select neighborhoods in order to live among those similar to themselves.