Based on the behavior shown in the following table, which of the following is a variable cost?

$\backslash$table$[[$Units Produced,$2,3,4,5],[$Cost Per Unit of Materials,$500,500,500,500],[$Cost Per Unit of Labor,$500,333,250,200],[$Total Utilities Cost,$4,500,4,500,4,500,4,500]]$

Multiple Choice

Materials Cost

Labor Cost

Utilities Cost

All of the costs are variable