Which of the following is unique to firms with returns to scale (RTS) advantages, at least relative to firms in perfect competition? Group of answer choices A. RTS are more likely to exist in small markets while perfect competition is more likely to exist in large markets. B. RTS firms maximize profits where the average cost curve is negatively sloped. C. RTS firms have a size advantage over other firms in the industry. D. All of the above. E. Only a and c are true