Anatural monopoly is:
a. any situation in which only a single seller is allowed to exist.
b. a monopoly in which the goods produced are agricultural resources.
c. an industry that runs best when one firm produces all the output.
d. an industry in which the government provides all the output.
-- respond quickly--

The correct option is C) An industry that runs best when one firm produces all the output.

Explanation:

A monopoly is when the entire output is achieved through just one seller. Therefore it is characterized by a lack of competition among sellers in an economic reference in order to produce any good or service.

This can lead to a monopoly of high pricing on these products and services which is set on  a high profit margin thus making the seller high monopoly profits.

i got 3,4 and 5 as an answer