25A monopolistically competitive firm differs from a perfectly competitive firm in the long run in that __________.A. marginal cost equals the market price for a monopolistically competitive firm but not for a perfectly competitive firmB. profits are positive for a monopolistically competitive firm and zero for a perfectly competitive firmC. the demand curve faced by a monopolistically competitive firm is downward sloping, while the demand curve faced by a perfectly competitive firm is horizontalD. profits are zero for a monopolistically competitive firm and positive for a perfectly competitive firm