Boeing,a Manufacturer of Large Commercial Aircraft,raises Its Prices by 9

Boeing,a manufacturer of large commercial aircraft,raises its prices by 9 percent.Airbus,another manufacturer of large commercial aircraft,follows with an increase of 9.5 percent.Each of these companies is practicing a type of pricing strategy characteristic of

A) controlled competition.
B) monopolistic competition.
C) an oligopoly.
D) perfect competition.
E) a monopoly.