Choosing to reinforce behaviors sometimes mean adding a pleasurable consequence or a removing an unpleasant one – these are the basic building blocks of operant conditioning, a concept posited by B. F. Skinner.
From the options given, the most suitable example of reinforcement would be (B) give children words to use in place of physical aggression. By giving punishments to children who use physical aggression and giving appropriate reward for children who use words instead, the teacher would be able to change the children’s behaviors.