You are assigned a team project in one of your most important classes. you are concerned about this project because a large portion of your grade is dependent upon this team's performance. there are two hardworking and committed students on your team. however, you have one team member, zippo, who doesn't care about this course and thinks he has other, more important things to do. zippo has decided to let the others do the work. there are a few other team members who work hard as long as you are all together, but don't work well on their own. in this situation, your teammate zippo is illustrating which of the following concepts? a. storming. b. social loafing. c. norms. d. virtuality. e. the social facilitation effect.