The Findings from Acculturation Research Are Less Coherent Than Many

The findings from acculturation research are less coherent than many other topics largely because

A) you can't put people through an acculturation experiment-it is all correlational research.
B) there are no validated acculturation measures.
C) people's circumstances vary so much it makes it difficult to identify common patterns.
D) there is no consensual definition on what acculturation means.
E) immigrants do not like to have their experiences studied by researchers.