Answer:
The correct answer is letter "C": Diminishing returns.
Explanation:
The Law of Diminishing Marginal Returns states that as the number of new workers increases, an additional employee's marginal product at some stage would be less than the previous employee's marginal product. This is because at a certain point adding more employees implies not having enough space for the new hires to work which diminishes the marginal return of every new individual hired by the firm.
