Which statement is false?

A) Cigarettes,motor vehicles,and pipelines are industries with high concentration ratios.
B) Oligopolized industries have higher concentration ratios than monopolistic competitors.
C) The Electric Machinery Conspiracy case involved covert collusion.
D) None of these statements are false.

All the statements provided are true. High concentration ratios are characteristic of industries with few dominant firms, such as cigarettes, motor vehicles, and pipelines, indicating oligopolies. Oligopolized industries indeed have higher concentration ratios compared to those with monopolistic competition, reflecting less competition and more market power concentrated in fewer firms. The Electric Machinery Conspiracy case is a historical example of covert collusion among companies, further illustrating practices within oligopolized markets.