Consider a market with two firms, A and B. The market demand is p = 150 - Q , where Q = qA + qB, QA is the quantity of firm A , and 9B is the quantity of firm B . Assume both firms have the same marginal cost MC=30. How much will each firm choose to produce in Cournot equilibrium? O a. qA = 50, qB = 50 O b. qA = 40, qB = 40 O C. qA = 30, qB = 30 O d. qA = 20, qB = 20