Answer:
monopoly, but self-interest often drives them closer to the competitive outcome.
Explanation:
An oligopoly exists when a small number of firms control the resources and price in a market.
They tend to stop each other from having significant influence in the market.
Because of this self interest their monopolistic attribute tends to become more towatds a competitive outcome.
So no one firm has the monopoly of the market rather influence is shared
The short answer is that they are trusted more.
I would pick D.
there are more than one kind of dog breed