A Study Tests the Hypothesis That the Provision of Social

Multiple Choice

A study tests the hypothesis that the provision of social work intervention will reduce the school dropout rate.It finds that social work intervention reduces the dropout rate only of children whose families are experiencing high levels of family stress.In this study,what type of variable is "level of family stress"?

A) independent variable.
B) dependent variable.
C) moderating variable.
D) mediating variable.