Answer:
The correct answer is d) The production function gets flatter, while the total-cost curve gets steeper.
Step-by-step explanation:
Diminishing marginal product explains why, as a firm's output increases, The production function gets flatter, while the total-cost curve gets steeper.
A firm is producing x amount of units at a total cost of Y. If it were to increase production in 1 units, its total cost would rise.