With there are barriers to entry that keep competitors out of the market. a.) perfect competition b.) a monopoly c.) an oligopoly

The correct answer is B.

A monopoly is a market structure where a single firm serves the whole demand of a specific good or service. It does not face competitors because there are no products that can act as close substitutes, therefore, such firm has absolute market power to decide the price charged for its products. So, the monopoly is able to charge a higher price than in a perfect competition scenario and will earn much larger profits.

Morover, in order to protect its privileged position, the monopolist sets trade barriers that prevent new competitors from entering the industry. For example, monopolies are usually large firms that enjoy economies of scale therefore, if they want to, they can lower the prices of their products up to a point that is impossible for newly-born enterprises. Such cheap prices would attract the whole demand and the new firm would be forced to close down and abandon the sector.

explanation:

there are two statements that are incorrect.

1. the marshall plan was a lend lease program. it was an economic plan that europe redevelop itself after wwii.

2. einstein didn't really do anything to further the allied cause in building the bomb. he merely sent a letter to fdr telling him (in 1939) that if the united states entered the war, perhaps it would be wise to build the bomb before germany did. i would say this answer is incorrect, but when america entered the war 2 years later, fdr thought it might be a good idea to take einstein's advice.

the 4th choice is definitely so wrong that is likely the single answer of this question

yes.

an illinois concealed carry license (ccl) is required to conceal carry a firearm in illinois. the license permits the licensee to carry a concealed loaded or unloaded handgun on his or her person or within a vehicle.

in moral and political philosophy, the social contract is a theory or model that originated during the age of enlightenment and usually concerns the legitimacy of the authority of the state over the individual.

explanation: