What does the marginal revenue product of labor represent?

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The marginal output of capital multiplied by the wage rate.The extra income a company gains from hiring an additional worker.The extra profit a business obtains by adding one more labor unit.The extra revenue a company generates by selling one unit of labor.

Explanation

Option D states that the marginal revenue product of labor is the additional revenue a firm receives from selling one unit of labor, which correctly defines its meaning. Other options confuse labor with capital or profit rather than revenue.