Concept:Machine operators work directly on manufacturing a product, so their wages count as direct labour.
Explanation:In a manufacturing account, costs are grouped as direct materials, direct expenses, direct labour, and indirect costs.
Direct labour is the cost of workers who are directly involved in making the product.
Machine operators physically help produce the goods, so their wages can be directly traced to production.
They are not indirect labour because indirect labour includes workers like supervisors or maintenance staff who are not directly making goods.
They are also not direct expenses, since direct expenses are costs other than materials and labour, such as royalties or special machine hire.
Therefore, wages of machine operators are classified as direct labour.
Answer:C. direct labour