In the short run, assume diminishing marginal product of labor sets in with the hiring of the second worker, then the Fixed cost will remains constant.
The concept of diminishing marginal productivity states that increasing the amount of some inputs (variable inputs) during the production period while keeping other inputs constant (fixed inputs) will eventually lead to decreased productivity.
In the short run, assume that the hiring of the second worker results in diminishing marginal product of labor, and the fixed cost remains constant.
Therefore, option C is correct.
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