Which of the Following Is NOT a Reason Why Acculturation

Which of the following is NOT a reason why acculturation is challenging to study?

A) Longitudinal studies following people before, during, and after they acculturate are rare due to cost and difficulty.
B) Individuals move to new places for vastly different reasons.
C) Some individuals move to places that are more homogenous, and others move to places that are very diverse.
D) Individuals move to new places that vary in terms of similarity to the individual's heritage culture.
E) Most places where psychological research is conducted are becoming less diverse, making it difficult to find people who have acculturated.