Which of the Following Is an Example of Perfect Mediation

Multiple Choice

Which of the following is an example of perfect mediation?

A) The strength of the relationship between the predictor and the outcome is reduced by exactly half when the mediator is included in the model.
B) The relationship between the predictor and the outcome remains the same when the mediator is included in the model.
C) The interaction of the predictor and the mediator significantly predicts the outcome, but the variables themselves do not.
D) The relationship between the predictor and the outcome is completely wiped out when the mediator is included in the model.