Which is the best example of a firm's implicit costs?

Question

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Implicit costs are the opportunity costs of using resources that belong to the firm's owner or are supplied by the owner without any payment. The best example of a firm's implicit costs is the opportunity cost of owner-provided labor, as the owner could have used their time and skills to earn a wage elsewhere. Choices A, C, and D are all explicit costs, as they involve actual expenditures made by the firm.

Which Is the Best Example of a Firm's Implicit Costs