Which of the following is a legitimate reason for society to support a monopoly?

A. Patents encourage innovation. Without patents, scientists will have no protection over their inventions. Thus, they will have no incentives to invent new things.

B. Market power protects the monopoly's profits, which protect its shareholders' income.

C. Market power is great for the advertising of certain products, such as diamonds.

D. Certain monopolies, such as the taxicab medallions in New York City, have a long history.