Which of the Following Individuals Is Social Loafing

Which of the following individuals is social loafing?

A) Reuben, who was initially slightly against the new policy, but after the meeting, he is now whole heartedly against the new policy.
B) Tenshie, who is working extra hard on her new hockey team to try and impress the coach.
C) Randy, who is helping his buddies move a couch but is only pretending to lift his corner.
D) Muriel, who decided not to help the woman who was crying on the subway.