The following data refers to an unregulated monopolist: Quantity Total Revenue (S) Total Cost (S) Marginal Cost ($) 20 50 50 90 30 OutWNEO 120 10 140 15 150 40 150 80 37. Refer to the above information to answer this question. What is the profit-maximizing output? A. O. B. 3. C. 4. D. 5. E. 6