Both competitive firms and monopolies produce at the level where marginal cost equals marginal revenue. ​Then, other things remaining the​ same, why is price lower in a competitive market than in a​ monopoly? A. Competitive markets face perfectly elastic demand and marginal​ revenue, while monopolies face​ downward-sloping demand and marginal revenue. B. Competitive markets face perfectly inelastic demand and marginal​ revenue, while monopolies face perfectly elastic demand and marginal revenue. C. The government puts a cap on how much a competitive firm can​ charge, while a monopolist can charge any price it chooses. D. A competitive market sets its price where marginal cost equals​ demand, while a monopolist sets its price where marginal cost equals marginal revenue.