select the key term that best matches with the definition provided. - The process of controlling or directing a situation. Also one of the four factors of production, with responsibility for decision making - The amount added to total cost when one more unit of the variable input is used in production - The amount added to total physical product when another unit of the variable input is used in production - The amount added to total value product when another unit of the variable input is used. A. Management B. Marginal value product C. Marginal physical product D. Marginal factor cost