The metaphor of the invisible hand suggests the remarkable possibility that broader social good can emerge from selfish individual actions. Which of the following is an implication of Adam Smith's theory? Select the correct answer below: a. individuals and firms must act in their personal best interest at all times b. individuals and firms must always act in the best interest of society even if that goes against their personal self- interest c. individuals and firms choose group interest before self-interest d. people who focus on their own self-interest in the economic part of their life may focus on group interests in other parts of their life.