Each of the following is an oligopoly except

A) General Motors.
B) Hertz (car rentals) .
C) Phillip Morris (cigarettes) .
D) Microsoft (computer operating systems) .

General Motors

An American multinational corporation headquartered in Detroit, Michigan, that designs, manufactures, markets, and distributes vehicles and vehicle parts.

Hertz

A unit of frequency equal to one cycle per second, used to measure wave frequencies, such as sound waves or electromagnetic waves.

Oligopoly

A market structure characterized by a small number of firms controlling a large portion of the market share, which gives them considerable power to set prices and influence market conditions.