Answer:
B. units started this period in this process
Explanation:
The equivalent units is the metric to account cost for the period cost.
With stared during the period, the formula will be:
Started during the period - incomplete ending + incomplete beginning
Because the materials are added entirely at the beginning, the beginning WIP has all the materials already added. Those unit do not recieve any material therefore, none are incomplete.
Also, the ending is complete as well, so there is no incomplete portion
leaving the formula with:
started during the period - 0 + 0 = started during the period