Answer:
C. They tend to produce thing with the same characteristics. Examples would include diamonds and oil.
Explanation:
A cartel is an organization established with a formal agreement between a group of producers of a good or service to regulate supply in order to regulate or manipulate prices.
In another parlance, a cartel is a collection of independent businesses or countries that act together as a single producer and thus fix prices for the goods they produce and the services they render, without competition.
An example of a cartel is The Organization of Petroleum Exporting Countries (OPEC). OPEC is the world's largest cartel. It is a group of 14 oil-producing countries whose purpose is to coordinate and unify the petroleum policies of its member countries and ensure the stabilization of oil markets.