Suppose the correlation between two variables x and y is due, in part, to the fact that y is responding to changes in some unobserved third variable....

Suppose the correlation between two variables x and y is due, in part, to the fact that y is responding to changes in some unobserved third variable. What is this due to?(a) Cause and effect between x and y(b) The effect of a lurking variable(c) Extrapolation(d) Common sense(e) None of the above.