The correct option is C Apportioned among cost of goods sold and applicable to inventory
When the preliminary estimation differ from the actual overheads, the difference may be either under applied or over applied overheads. At the end of the year, the balance whether under applied or over applied overheads must be charged to the manufacturing cost or cost of goods sold. Under applied or over applied factory overheads are apportioned among cost of goods sold and applies to the inventory.