An assumption of the FIFO process-costing method is that:

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The assumption of the FIFO process-costing method is that the units in beginning inventory are assumed to be completed first before any new units are started or completed during the current period. This means that the cost of beginning inventory is transferred to the cost of goods sold before the cost of current production. Option B is incorrect because completing units in the beginning inventory is an assumption in this method. Option C is incorrect because it doesn't take into account production requirements or timing. Option D is incorrect because a calculation of conversion costs is possible, but it is done separately from the cost of goods sold calculations.

An Assumption of the FIFO Process-Costing Method Is That