A Limitation of Modeling Fitting in the Study of the Behavioral

A limitation of modeling fitting in the study of the behavioral genetics perspective of personality is that:

A) It includes information from many different types of research methods, thus providing a confounding influence on the results
B) The large samples sizes necessary to do this type of research introduces a variety of biases by the participants
C) It is based on correlational data, thus limiting the determination of causal influences
D) a & b
E) b & c