Why is competition limited in an oligopoly

An oligopoly is a kind of business wherein a surprisingly few numbers of producers produce nearly the whole supply of goods used by the people. Establishing up a brand and inciting enormous set-up expenses such as installing up production plants and mutable expenses like wages of workers related to different brands is very very hard as it requires billions of dollars.

answer: c  

the factory goes out of business, causing the workers to lose their jobs.

explanation:

we need the pie chart in order to