To ensure that marginal revenue is the same as price the government usually regulate natural monopolies. (the right option is A). If one company can serve a market more affordably than any combination of two or more enterprises, that market has a natural monopoly.
As an illustration, the utilities sector is a natural monopoly. To cities and towns across the nation, utility monopolies offer water, sewage, electricity transmission, and energy distribution services including retail natural gas transmission. A government market with a natural monopoly is one whose size allows a single vendor to supply the output. A natural monopolist can generate all of the market's product for less money than it would cost if there were several competing company.
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