What is the relationship between a​ monopolist's demand curve and the market demand​ curve? A. A​ monopolist's demand curve is greater than the market demand curve. B. A​ monopolist's demand curve is the same as the market demand curve. C. A​ monopolist's demand curve is upward sloping and the market demand curve is downward sloping. D. The market demand curve has twice the slope of a​ monopolist's demand curve. E. The market demand curve is the sum of the demand curves for all firms in the market. What is the relationship between a​ monopolist's demand curve and its marginal revenue​ curve? A. A​ monopolist's marginal revenue curve has twice the slope of its demand curve due to diseconomies of scale. B. A​ monopolist's demand curve is the same as its marginal revenue curve. C. A​ monopolist's marginal revenue curve has twice the slope of its demand​ curve, because to sell more​ output, a monopoly must lower price. D. A​ monopolist's demand curve is downward sloping and its marginal revenue curve is upward sloping. E. A​ monopolist's marginal revenue curve has half the slope of its demand​ curve, because to sell more​ output, a monopoly must lower price.