Red Company Had Work-In-Process Inventories That Were 45% Complete at the Start

Red Company had Work-in-Process Inventories that were 45% complete at the start of the month.Work-in-Process at the end of the month was 10% complete.Materials were added at the beginning of the process.If weighted-average process costing is used,the total equivalent units for materials will equal the number of units:

A) transferred out during the period.
B) started and completed during the period.
C) started into the process during the period.
D) transferred out during the process plus the units in the ending inventory.