Which of the Following Is a Potential Problem of Using

Which of the following is a potential problem of using correlational studies in psychological research?

A) They do not enable researchers to establish a causal connection between variables.
B) They do not allow researchers to use just one variable to predict the movement of the other variable.
C) They cannot be used in situations where the issue of ethics is important.
D) They can be used to study the relationship between only two variables.