A researcher tells a group of experimental subjects that they are going to receive "painful" electrical shocks as part of the
experiment. He tells another group that they will receive "mild" electric shocks. He asks participants in both groups whether they
prefer to wait alone or with others while he sets up the machinery that will deliver the shocks. In this experiment, which of the
following is the dependent variable?
-the participants' choice to wait alone or with others
-the use of the term "mild"
-the machinery that delivers the shocks to the participants
-the use of the term "painful"
