Final answer:
Indirect labor refers to employees who are not directly involved in the production process but still contribute to the overall operations of a company. In this case, the correct option would be (b) a stores assistant in a factory store.
Step-by-step explanation:
Indirect labor refers to employees who are not directly involved in the production process but still contribute to the overall operations of a company. In the given options, (b) a stores assistant in a factory store would be classified as indirect labor.
The stores assistant is responsible for managing inventory and ensuring that materials and supplies are available for production, but they do not directly participate in the manufacturing process like the assembly workers or plasterers. Therefore, the correct answer is (b) a stores assistant in a factory store.