Answer: D. both the fixed costs and the variable cost per unit may change
Step-by-step explanation:
It is said that Fixed costs do not change regardless of production level but this is not entirely true. Fixed costs usually do not change for a production range but if the range is passed, the fixed costs might then increase and a new fixed cost for the new relevant range will be charged.
Variable costs are variable because they change with production so if the company is producing more units, they will be incurring more variable costs.
In conclusion therefore, if the company produces more units than its relevant production range, it risks both fixed and variable costs changing.