Which of the following statements is true? Figure 13-18 Question 1 options: A) Da represents the long-run demand curve facing a monopolistic competitor in a constant-cost industry while Db depicts the demand curve in the short run. B) Da represents the long-run demand curve facing a monopolistic competitor in a constant-cost industry while Db depicts the long-run demand curve in an increasing-cost industry. C) Da represents the long-run demand curve facing a perfect competitor while Db depicts the long-run demand curve facing a monopolistic competitor. D) Da represents the long-run supply curve in a perfectly competitive, constant-cost industry while Db depicts the long-run demand curve facing a monopolistic competitor in a decreasing-cost industry