Concept:A monopolist faces a downward-sloping demand curve, so selling more output requires a lower price.Explanation:Total revenue is given by TR=P×Q.A monopolist cannot increase both price and quantity at the same time because higher price reduces quantity demanded.To sell a larger quantity, the monopolist must lower the price.If the increase in quantity sold is proportionally greater than the fall in price, total revenue will rise.Therefore, a monopolist can boost revenue by reducing price.Answer:D. reducing price