Actually, none of the choices are correct. Perhaps your inquiry was incomplete, and the "letter d" stood for average revenue equaling marginal cost.
A monopoly is actually unproductive because they limit output below the amount of production that is socially efficient.
You should be aware that the socially efficient level of output occurs at the intersection of the marginal cost curve and demand.
However, a monopolist generates less than the socially efficient quantity of production while charging a greater price than a competitor in a competitive market.
"For a monopoly, where an average revenue equals marginal cost, the socially efficient level of output occurs where average revenue equaling marginal cost."
Find out where the monopolistically competitive firm always matches the point for profit-maximizing: brainly.com/question/14286565
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