The correct answer is work in process inventory control.
When a large number of similar products are manufactured, a process costing system accumulates costs. In this case, it is more effective to accumulate costs for a large batch of products and then distribute them to individual units produced. The presumption is that the cost of each unit is the same as the cost of any other unit, hence tracking information at the individual unit level is unnecessary.
A process costing method is used by any large-scale firm who produces huge quantities of identical commodities. A petroleum refinery is a perfect example of a process costing environment since it is hard to trace the cost of a specific unit of oil as it passes through the refinery.
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