28. Suppose a competitive market is comprised of firms that face identical cost curves. The firms experience an increas in demand that results in positive profits for the firms. Which of the following events are then most likely to occur? (i) New firms will enter the market. (i) In the short run, price will rise; in the long run, price will rise further. (ii) In the long run, all firms will be producing at their efficient scale a. () and () only b. (i) and (ii) only C. (ii) and (iii) only d. (i), (i) and (ii)