If the marginal social benefit of consuming a good or a service exceeds the marginal private cost (a) a negative externality exists.(b) the market achieves economic efficiency.(c) the sum of consumer surplus and producer surplus is maximized.(d) a positive externality exists.

The correct answer is option D.

Explanation:

An externality can be defined as a situation in which the benefit or cost resulting from an activity is received or incurred by a third person.

A positive externality means a third person receives the benefits of someone else's activities.

If the marginal social benefit earned from the consumption of a good is higher  than the marginal private cost incurred then in that case we can say that a positive externality exists in the market.

People have to pay less but are having greater profit.

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