Which of the following statements most correctly describes the competition in the market in which the described firm operates?

a) A monopolist is the only firm selling goods in the market; it has no real competitors.

b) A monopsonist is the only firm selling goods in the market; it has no real competitors.

c) An oligopolist is the only firm selling goods in the market; it has no real competitors.

d) An oligopolist competes with many firms selling similar, but not identical, products.