Which of the following is an example of the law of diminishing marginal​ returns?A.Holding capital​ constant, when the amount of labor increases from 5 to​ 6, output increases from 20 to 25. Then when labor increases from 6 to​ 7, output increases from 25 to 28.B.Holding capital​ constant, when the amount of labor increases from 7 to​ 8, output increases from 36 to 42. Then when labor increases from 8 to​ 9, output increases from 42 to 50.C.When capital and labor both increase by 20​ percent, output increases by only 15 percent.D.When labor increases by 20 percent and capital decreases by 15​ percent, output remains constant.

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