Answer:
The answer is (A) a small number of interdependent firms with natural or legal barriers preventing the entry of new firms.
Step-by-step explanation:
Oligopoly has a similar market type as a monopoly – with one key difference: There are multiple players that are controlling the market. The number of players in this market segment may not be plentiful due to the high entry barriers. This is its main difference to a perfect competition market or monopolistic market. An example of oligopoly would be the oil and gas industries, where the major players – either regional or global-wise are just a handful.