Vary in total in direct proportion to changes in the activity level. As this cost increase or decrease, the output level.
Variable costs are proportional to output, resulting in a fixed sum per unit produced. It indicates that when more products are manufactured, variable costs will rise; conversely, if fewer products are manufactured, variable costs will fall.
Thus, option C is correct.
For more details about variable cost dependency, click here:
https://brainly.com/question/17042175
#SPJ1