please solve and show work

Your Company is attempting to classify costs according to their cost behavior. Some are variable, some are mixed and some are fixed. Use the data concerning activity and costs listed below to identify all the variable costs. Look at how the dollars change between January and February, not what the costs are called. January February 1,200 1,400 Units $600 $700 Costs (total) Maintenance Supplies Insurance $750 $790 $800 $800 Utilities $888 $1,036 Lubrication $560 $576 Advertising $900 $1,050 O maintenance and supplies. maintenance, supplies, utilities, lubrication and advertising. maintenance, utilities and advertising. supplies and advertising