You Are Working with a Group of Teenagers Living in a Residential

You are working with a group of teenagers living in a residential treatment facility.They share the attitude that it is better to protect yourself than to cooperate with others.This is an attitude that you wish to change,in order to help them become more contributing members of society.Which technique might you use if you were to employ the self-perception theory for the purpose of attitude change

A)  Provide clear reinforcers for every instance of cooperative behaviour that you see. 
B)  Give each resident an autobiography of a famous athlete who talks about how teamwork is the key to success. 
C)  Have each resident write a reflection about the dangers of being too independent. 
D)  Have potential employers come in to talk about how important cooperation is in the modern workplace, and how they need to learn how to work as members of a team.