Within the relevant range, a difference between variable costs and fixed costs is:

A) variable costs per unit fluctuate and fixed costs per unit remain constant.
B) variable costs per unit are constant and fixed costs per unit fluctuate.
C) both total variable costs and total fixed costs are constant.
D) both total variable costs and total fixed costs fluctuate.

Variable Costs

Costs that change in proportion to the level of production activity or volume, such as materials and labor directly involved in production.

Fixed Costs

Expenses that remain constant regardless of production or sales volume in the short term, like lease payments or wages.

Relevant Range

The range of activity within which the assumptions about cost behavior hold true for a specific operation or business.