Which of the Following Statements Is NOT Correct

Multiple Choice

Which of the following statements is NOT correct?

A) In order for variable A to cause variable B, variable A must occur before variable.
B) If variable A causes variable B, then variable A and variable B will usually be correlated with one another.
C) It is possible for a dependent variable to have more than one cause.
D) If there is a correlation between two variables, then one of those variables must be having an effect of some sort on the other.
E) A suppressor variable causes two variables to appear to be uncorrelated with one another when they actually are correlated.