Do You Believe That a Theory of What Makes an Action

Do you believe that a theory of what makes an action right should also provide an account of why we should perform right actions? If you do not, explain what you think the purpose of moral theories is, if they are not intended to motivate persons to do the right thing. If you do think that moral theories should be prescriptive in this sense, choose either (a) Kantian deontology, or (b) utilitarianism, and determine how well they achieve this end.