Scenario 2 a Researcher Was Interested in the Effects of Mood on Mood

Scenario 2
A researcher was interested in the effects of mood on aggression.She decided to see how receiving an insult or a compliment affects aggression,and she measured aggression by having participants administer small shocks to another participant.The researcher found that participants in the insult condition were more aggressive than those in the compliment condition.
-Refer to Scenario 2.In this research,what is the conceptual independent variable?

A) administering of small shocks
B) receiving a compliment or insult
C) mood
D) aggression