Which set lists the four main categories of inventory?

Which set lists the four main categories of inventory?

• A. Raw materials, work-in-process, finished goods, maintenance, repair, and operating supplies
• B. Raw materials, finished goods, WIP, MRO
• C. Raw materials, WIP, finished goods, packaging
• D. Raw materials, WIP, finished goods, service inventory

Answer: (B)

In manufacturing and operations, inventory is organized by its role in the production process: raw materials are the basic inputs, work-in-process are items currently being transformed, finished goods are ready-to-sell products, and MRO supplies (maintenance, repair, and operating items) support the production and upkeep of the facility. The four categories together cover everything needed to run production and maintain operations, from inputs to completed products and the tools and materials that keep everything running.

This option lists exactly those four categories—raw materials, work-in-process, finished goods, and MRO supplies—merely in a different order, which is why it’s the best choice. Other options introduce packaging or service inventory, which aren’t standard main categories for manufacturing inventory.