Answer:
c.materials used directly in the manufacturing process of the product
Step-by-step explanation:
Factory cost or production cost are usually classified as direct or indirect.
Direct cost are those costs incurred that are directly linked to production.
This includes direct labour, direct material, etc. Indirect costs are also referred to as overheads.
These are cost incurred that may not be linked directly to the production of goods and services. Examples include salaries of production supervisors, insurance on factory equipment etc,