mathxl.com/Student/PlayerHomework.aspx?homeworkld=610075659&questionld=26&flushed=true&cld=6700471¢erwin=yes 21F-ECON101-010/011 Natalija Penev & | 12/05/21 3:51 PM Homework: MyLab: Chapter 15 Question 4, End of Chap... HW Score: 1.67%, 1 of 60 points Points: 0 of 1 Save What are the four most important ways a firm becomes a monopoly? The four main reasons a firm becomes a monopoly are: O A. antitrust legislation, control of a key resource, no close substitutes, and economies of scale. B. antitrust legislation, control of a key resource, arbitrage, and economies of scale. O C. the government blocks entry, control of a key resource, network externalities, and diseconomies of scale. O D. the government blocks entry, control of a key resource, network externalities, and economies of scale. O E. the lack of patents and copyrights, control of a key resource, network externalities, and economies of scale. Help me solve this Etext pages Get more help - Clear all Question Viewer Final check