Which Child Is Most Likely to Act Altruistically Toward Gunter

Multiple Choice

Which child is most likely to act altruistically toward Gunter, who is having a very difficult time learning how to skate?

A) Jerry, who is not very good at skating
B) Tetsuro, who is feeling happy
C) Sanjay, who was yelled at by the rink attendant only minutes ago
D) Ruby, who would have to miss her only ride home in order to help Gunter