During an experiment, participants were completing surveys when smoke started to enter the room, and it appeared that there was a fire in the adjacent room (i. e., the smoke detector was blaring, sounds of fire crackling could be heard). When seated with ten confederates, who were actors told by the experimenter to intentionally ignore the smoke and to not respond in any way, how many of the participants leave immediately once they see smoke entering the room from what seems to be a kitchen fire