"There Will Be Differences in Degree of Mood Elevation Seen

Multiple Choice

"There will be differences in degree of mood elevation seen in depressed clients after receiving either cognitive-behavioral or psychoanalytic therapy." During a test of this hypothesis,it was discovered that some of the participants lived with family members and others lived alone.This variable,living situation,is a/an ________.

A) independent variable.
B) dependent variable.
C) constant.
D) confounding variable.