The fourth alternative is correct (D).
Monopolistic competition consists of an economic system where few companies compete with each other, but each has a relative monopoly power because they sell slightly differentiated products.
An example are the two telephone companies, which sell packages with price, minute, internet, etc. to compete for the same customer.
The two phone providers, each offering benefits to customers who switch to its service, are the business in monopolistic competition.
Monopoly is a situation where there is a single seller in the market. In conventional economic analysis, the monopoly case is taken as the polar opposite of perfect competition. By definition, the demand curve facing the monopolist is the industry demand curve which is downward sloping.
A monopoly is when one company and its product dominate an entire industry, whereby there is little to no competition and consumers must purchase that specific good or service from the one company.
Thus, option D is true as both companies have same product and trying to snatch more customers.
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