Dr Vela Is Studying Comorbid Substance Use Disorders and Anxiety

Multiple Choice

Dr. Vela is studying comorbid substance use disorders and anxiety disorders among African Americans, non-Hispanic white Americans, Hispanic Americans, and Native Americans between 15 years and 65 years of age. Dr. Vela is using a:

A) multigroup design.
B) factorial design.
C) case study design.
D) repeated measures design.