When Calculating Unit Costs Under the Weighted-Average Process Costing Method

When calculating unit costs under the weighted-average process costing method, the unit cost is based on:

A) only the current period's manufacturing costs.
B) only costs incurred in the period's beginning work-in-process inventory.
C) a summation of the cost of work in process inventory plus the cost incurred during the current period divided by total equivalent units.
D) only costs incurred in previous accounting periods.
E) a summation of the cost of work in process inventory plus the cost to be incurred in the upcoming period divided by total equivalent units.