Suppose a Monopoly Sells to Two Identifiably Different Types of Customers,A

Multiple Choice

Suppose a monopoly sells to two identifiably different types of customers,A and B,who are unable to practice arbitrage.The inverse demand curve for group A is P_A = 10 - Q_A,and the inverse demand curve for group B is P_B = 18 - Q_B.The monopolist is able to produce the good for either type of customer at a constant marginal cost of 2,and the monopolist has no fixed costs.If the monopolist practices group price discrimination,the profit-maximizing prices charged to each type of customer are

A) P_A = 6, and P_B = 10.
B) P_A = 4 and P_B = 8.
C) P_A = 10, and P_B = 6.
D) P_A = 8, and P_B = 4.