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 70% probability that the firm will have a 20% return and a 30% probability that the firm will have a -30% return The standard deviation for the return on an individual firm is closest to O A. 9.17% OB. 11.46% O C. 5% OD. 22.91% lick to select your