Why is it difficult for a small firm to enter an oligopolistic market? Responses A Firms in oligopolistic markets are large and produce high volumes of goods at low costs.Firms in oligopolistic markets are large and produce high volumes of goods at low costs. B Oligopolies only develop in markets in which switching from one brand to another is expensive for consumers.Oligopolies only develop in markets in which switching from one brand to another is expensive for consumers. C In order to operate in an oligopoly, firms must own the various factors of production.In order to operate in an oligopoly, firms must own the various factors of production. D Expensive government licenses are required for any firm operating in an oligopoly.Expensive government licenses are required for any firm operating in an oligopoly