Answer:
A. High entry costs prevent new producers from entering the market.
Explanation:
Oligopoly is the opposite of monopoly (only one company that offers a service or is the supply). An oligopoly has few companies offering one service or product which can control the supply and market price of it, such as automotive sector or airline. One of the things that limited competition in an oligopoly is the costs of entry, to set up the manufacturer, to make research and marketing and be able to compete with these companies the entry cost is high.
Answer:An attack aircraft, strike aircraft, or attack bomber, is a tactical military aircraft that has a primary role of carrying out airstrikes with greater precision than bombers, and is prepared to encounter strong low-level air defenses while pressing the attack.
I'm not exactly sure what you are asking but it could be a(4)
