Answer: B. The industry which they operate
Explanation:Different companies carry out the functions of purchasing, procurement and supply differently and these depend on how they operate. For example supply chain in a manufacturing company, it will produce items that will be stored in warehouses and other locations, making the supply chain more complex, on the other hand if it's a Service Provider company which uses a make-to-order business model, there will be no need for storing finished products, Therefore, it is clear that supply chains including procurement , purchasing and supply depend on the nature of the company.