All of the above statements are true about the monopoly.
What is Monopoly?
It is a market arrangement in which there is just one seller and they have an exclusive product to sell. In a monopoly market, there is no competition for the seller because there is no other close equivalent for the goods he is selling.
In a monopoly market, elements such as a government license, resource ownership, copyright, and patent, as well as a high entry cost, turn a firm become a single seller of goods. These all function as barriers to other sellers entering the market. A monopoly is at the opposite end of the spectrum of a perfectly competitive firm.
Therefore option D is correct.
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