What Does the Third-Variable Problem Indicate

Multiple Choice

What does the third-variable problem indicate?

A) The three variables are all causally related to one another;each is a cause of the others.
B) The correlation between any two of the variables must be established before another correlation can be computed.
C) Two of the variables are correlated with each other only because each is causally related to a third variable.
D) Changes in one variable are producing changes in another variable.