The correct answer is: C. Fixed/remain constant.
Fixed costs are costs that do not change in the short run, regardless of the level of output. Examples of fixed costs include rent, insurance, and depreciation.
When the per unit output increases, the total fixed cost remains the same. This is because the fixed cost is spread out over a larger number of units, so the per unit cost decreases.
For example, if a company has a fixed cost of $100,000 and produces 10,000 units, the per unit cost is $10. If the company produces 20,000 units, the per unit cost is $5.
The other options are
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