answer as soon as posible

Consider the short-run and long-run cost curves for a firm. If factor prices decrease, Select one: A. there will be no change in the cost curves in the long run. B. the firm will move down along both its long-run and shortrun average cost curves. C. the firm will move down along its long-run average cost curve only. D. both the long-run and short-run average cost curves will shift downward. E. there will be a downward shift in the long-run average cost curve but not in the short-run average cost curve