Concept:Marginal product refers to the extra output generated by using an additional unit of input.
Explanation:When one more unit of input is added to production, the increase in total output is called the marginal product of that input.
It is calculated as the change in total output divided by the change in the quantity of input.
Average product is the total output per unit of input, not the extra output from an additional unit.
Utility measures satisfaction, and “output of the input” is not a standard economic term.
Therefore, the statement matches the definition of marginal product.
Answer:A. marginal product of the input