What Is a Simple Main (Conditional) Effect

Multiple Choice

What is a simple main (conditional) effect?

A) The effect of X₂ on X₁ when Y is equal to 0
B) The effect of X₁ on X₂ when Y is equal to 0
C) The effect of X₂ on Y when X₁ is equal to 0
D) The effect of X₁ on Y when X₂ is equal to 0