The Slicing Department Production Process Shows How Many Units Were Started into Production in Department 1

The Slicing Department production process shows: $\begin{array}{lr}&\text { Units }\\\text { Beginning Work in Process } & 10,000 \\\text { Ending Work in Process } & 50,000 \\\text { Total units to be accounted for } & 180,000\end{array}$ How many units were started into production in Department 1?

A) 190,000.
B) 130,000.
C) 180,000.
D) 170,000.