Consider an economy with two types of firms, S and I. S firms always move together, but I firms move independently of each other. For both types of firms there is a 80% probability that the firm will have a 20% return and a 20% probability that the firm will have a - 30% return. What is the expected return for an individual firm? A. - 10% B. 10% C. -20% D. 6%