Which of the Following Statements Is True About Social Loafing

Which of the following statements is true about social loafing?

A) Clearly communicating to group members why each person's contributions are valuable to the group is an effective means by which managers and group members can reduce social loafing.
B) Rewarding group contributions reduces social loafing.
C) Ensuring a large group size reduces social loafing.
D) One way that managers can effectively eliminate social loafing is by making group contributions identifiable so that group members perceive that low and high levels of group effort will be noticed.
E) One way that managers can effectively eliminate social loafing is by forming groups with a significantly higher number of members than the number of members needed to accomplish group goals.