which of the following statements is (are) true of a monopoly? (i) a monopoly has the ability to set the price of its product at whatever level it desires. (ii) a monopoly's total revenue will always increase when it increases the price of its product. (iii) a monopoly can earn unlimited profits. select one: a. (i) only b. (ii) only c. (i) and (ii) d. (ii) and (iii)