Ten Children Are Sitting on a Bench While an Adult,Tom,speaks

Ten children are sitting on a bench while an adult,Tom,speaks to them.Tom tells them that he will count to three,after which all the children must yell "Hello." The louder they yell (as measured by a decibel meter) ,the more money they get.After Tom counts to three,you see that one child off to the side is engaging in social loafing.Which of the following would explain the child's behavior?

A) The task was too easy.
B) The child is from an interdependent culture.
C) The whole group consists of girls.
D) Yelling "Hello" was intrinsically rewarding.
E) The other children are all related to the child in some way.