Answer:
C. This firm is one of a handful of cement manufacturers in a small country. There are barriers to entry due to the necessity of controlling specific resources to make cement.
Explanation:
An oligopoly is defined as a market situation where a few businesses exist in a given market, with none of them having ability to keep others from having significant influence.
A monopoly is when only one supplier exists in a market, a duopoly is when there are 2 suppliers, while an oligopoly is when number of supplier is more than 2.
But the number must be small enough that the actions by one firm significantly affects others.
When a firm is one of a handful of cement manufacturers in a small country, and there are barriers to entry due to the necessity of controlling specific resources to make cement. It is an oligopoly