Cindy Established That Gender Came Before Voting in Her Study

Cindy established that gender came before voting in her study of adults in her city,so the time order was clear.She also ruled out the effects of age,religiosity,and other "third" variables.Which criterion for causality remains for her to establish?

A) that no serious ethical violations have occurred
B) that no serious political violations have occurred
C) that the unit of analysis is appropriate
D) that the variables are correlated
E) that a causal relationship exists