Please help with this question. I do not understand it please help. I need to it for my homework please.

Chester Farms, Inc., a monopoly producer of asthma medication , has constant average total cost equal to $9. At its profit maximizing level of output, Chester Farms charges $19 for its product and earns $2,500 in profits. The loss in consumer surplus due to higher prices charged by the monpolist is $10,000. If the industry were a competitive industry, output would be: 0 A. 3,000 O B. 2,500 O C. 1,750 O D. 500 O E. 300