Which of the Following Scenarios Would Represent a Monopoly

Which of the following scenarios would represent a monopoly?

A) In a city,there are five hotels for visitors to stay.
B) In a city,there are 1,300 different restaurants.
C) In a city,there are 10 different carpet cleaning companies.
D) In a city,there is one Ethiopian restaurant.
E) In a city,there are two taxi cab companies.