Considering the accounting principle, when reporting inventory using the lower cost or market method, the market should not be more than "Net realizable value less a normal profit margin."
This is because the lower cost or market method is a method that emphasizes that during the inventory measurement, inventory should be documented on the balance sheet using their historical price or the market value, that is, the value of the inventory when purchased.
This implies that the replacement cost of inventory cannot be lower than net realizable value, less a normal profit margin.
Hence, in this case, it is concluded that the correct answer is option D. "Net realizable value less a normal profit margin."
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