Final answer:
The total contribution margin will turn from negative to positive once the level of volume exceeds the break-even point.
Step-by-step explanation:
The correct answer is d. the total contribution margin will turn from negative to positive.
Break-even point is the level of output or sales at which total revenue equals total cost, resulting in zero profit. Once the level of volume exceeds the break-even point, a firm starts making profits. Therefore, the correct answer is d. the total contribution margin will turn from negative to positive.