Which of the Following Is TRUE

Which of the following is TRUE?

A) Cross-classification tables are useful in proving cause and effect relationships.
B) The presence of association in a cross-classification table demonstrates conclusively that X and Y are related in the real world.
C) A causal factor must occur before the effect or event it causes.
D) When considering the time order of occurrence of variables as evidence, each term in the relationship must be either a cause or an effect. They cannot be both.
E) They are all false.