Which of the Following Statements About Helping Behavior and Social

Which of the following statements about helping behavior and social norms is true?

A) The social-responsibility norm operates most effectively as people respond publicly to deeds earlier done to them.
B) The reciprocity norm usually serves as a reminder to people to balance giving and receiving.
C) The social-responsibility norm decrees that people should help those who need help with regard to future exchanges.
D) The reciprocity norm compels us to help those most in need and those most deserving.