Correlation and Causation

Which one of the six different variations of the causes for the relationship between correlation and causation is false? a. two variables may be correlated because x casues y b. two variables may be correlated because y causes x c. two variables may be correlated because of an implied causation between x and y d. two variables may be correlated because they interact e. two variables may be correlated because of a lurking variable f. two variables may be spuriously related