Karen Knows That Her Neighbors Often Struggle to Make Ends

Karen knows that her neighbors often struggle to make ends meet.She sometimes offers to babysit for free because she can easily afford to do so and feels good that she can help in this small way.This example most clearly illustrates the

A) empathic joy hypothesis.
B) negative state relief model.
C) empathy-altruism model.
D) defensive helping.
E) kin selection.