Which Statement Describes a Correlation Between Two Variables

Which statement describes a correlation between two variables?

A) Correlated variables strongly imply their change is caused by a third,perhaps unknown,variable.
B) Correlated variables are dependent;how they change is predicted by change in a third unknown variable.
C) Correlated variables are interdependent;as one varies so does the other in a predictable fashion.
D) Correlated variables are independent;how one varies does not have an effect on how the other varies.
E) Correlated variables demonstrate causality;change in the independent variable directs change in the dependent variable.