Efficiency in a market is achieved when the sum of producer surplus and consumer surplus is maximized, Thus, the correct option is C).
Market efficiency refers to the degree how well current prices reflect all the available and relevant information about the assets and securities.
The more information available to all the market participants, would make the more efficient. There are three common types market efficiency are allocative, operational and informational.
Basically, a market is consider to be efficient if the allocation of resources maximises total surplus.
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