Which of the Following Observations Is NOT True of Monopolistic

Which of the following observations is NOT true of monopolistic competition?

A) A number of different firms offer marketing mixes that at least some customers see as different.
B) Marketing managers try to differentiate very similar products by relying on other elements of the marketing mix.
C) Each competitor tries to get a monopoly in its own target market.
D) Most marketing managers in developed economies do not face monopolistic competition.
E) Competition exists because some customers see various alternatives as substitutes.