Answer:
Only options A, B, and D are correct.
Oligopolistic industries may promote technological progress.
Oligopolies may engage in limit pricing to keep out potential entrants.
Oligopolies can be kept in line by foreign competition.
Explanation:
A market competition where the number of sellers controls the market at large is referred to as oligopoly.
Oligopolies can successfully threaten competition, they restrict output to maximize profits. Some oligopolies have a very less number of firms in competition, this allows them to act more like a monopoly, while other industries have a higher number of firms make it more difficult to determine the best price.
The oligopolistic firms who are price leaders often limit the prices to hinder new entrances, because at a higher price a new entrant can survive on a smaller market share and dilute the concentration of competition. However, several factors limit the pricing power of oligopolies, these include foreign competition and technological advances.
Therefore, only options A, B, and D are correct.