The correct answer is: D. non inventoriable costs
Abnormal spoilage is a type of spoilage that is not expected to occur in the normal course of business. It is caused by unusual events, such as accidents, natural disasters, or employee negligence. The cost of abnormal spoilage is not included in the cost of goods sold, but is instead treated as a loss.
Conversion costs are the costs of converting raw materials into finished goods. They include direct labor and manufacturing overhead.
Sunk costs are costs that have already been incurred and cannot be recovered. They are not relevant to future decisions.
Inventoriable costs are the costs of goods that are expected to be sold in the future. They include the cost of materials, labor, and overhead that are directly associated with the production of those goods.
Non inventoriable costs are the costs of goods that are not expected to be sold in the future. They include the cost of abnormal spoilage, as well as the cost of goods that are damaged or lost.