Most Studies of the Relationship Between Mental Illness and Immigration

Most studies of the relationship between mental illness and immigration status have found that

A) the later the age of immigration, the later the onset of any psychiatric disorders.
B) the earlier the age of immigration, the later the onset of any psychiatric disorders.
C) the later the age of immigration, the earlier the onset of any psychiatric disorders.
D) there is no correlation between the age of immigration and the onset of psychiatric disorders.