Why Is It Important to Take Income Level or Socioeconomic

Why is it important to take income level or socioeconomic status into account when comparing differences in rates of particular disorders across ethnic groups?

A) Ethnic minority groups tend to be disproportionally represented among lower socioeconomic status levels, and people with household incomes below the poverty line stand an increased risk of developing various psychological disorders.
B) Ethnic minority groups tend to have higher socioeconomic levels that are associated with higher risk of developing psychological disorders.
C) Only people from certain ethnic groups with a high level of socioeconomic status develop certain disorders, such as depression and anxiety.
D) Schizophrenia occurs only among certain ethnic groups who tend to have household incomes near the poverty line.