The Diagram Below Shows a Pharmaceutical Firm's Demand Curve and Marginal

The diagram below shows a pharmaceutical firm's demand curve and marginal cost and marginal revenue curves for a new heart medication for which the firm holds a 20- year patent on its production.
FIGURE 10- 5
-Refer to Figure 10- 5.Assume this pharmaceutical firm is practicing perfect price discrimination among its buyers.At its profit- maximizing level of output it will produce

A) Q1 units and charge a price of p1 on the last unit sold.
B) Q0 units and charge a price of p0 on the last unit sold.
C) Q1 units and charge a price of p1 on all units.
D) Q0 units and charge a price of p0 on all units.
E) It is not possible to determine with the information provided.