In a mediation analysis, after establishing that the pairwise correlations are significant among the independent variable (X), the mediator (M) and the dependent variable (Y), what must occur in the final step to demonstrate that M is a significant full mediator of the relationship between X and Y?单项选择题

A

The total effect of X on Y is greater than the direct effect.

B

All relationships tested in the last step remain significant.

C

The correlation between X and M is larger than between X and Y.

D

The direct effect of X on Y becomes nonsignificant when M is included in the model.

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