A and D definitely, maybe an argument could be made for C. B, however is definitely incorrect.
A monopoly is an enterprise that is the only seller of a good or service. In the absence of government intervention, a monopoly is free to set any price it chooses and will usually set the price that yields the largest possible profit. Just being a monopoly need not make an enterprise more profitable than other enterprises that face competition: the market may be so small that it barely supports one enterprise. But if the monopoly is in fact more profitable than competitive enterprises, economists expect that other entrepreneurs will enter the business to capture some of the higher returns. If enough rivals enter, their competition will drive prices down and eliminate monopoly power.
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What that's question please use only English
Opportunity cost is the profit lost when one alternative is selected over another. ... Opportunity cost does not necessarily involve money. It can also refer to alternative uses of time. For example, do you spend 20 hours learning a new skill, or 20 hours reading a book?
<span>upper, middle, lower are corrrect
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