Stanley was sitting on his front porch when he saw a child run into the street after a stray ball. The child did not see that there was a car coming, and Stanley knew something very bad was about to happen. He jumped off of his porch, ran into the street,

and just snatched the child out of the way before the car hit them. Stanley and the child were fine, but his action, taken without concern for his own safety, is an example of __________.
a. self-sacrifice
b. altruism
c. prosocial behavior
d. collectivism

Answer: B