Inventory Balances for Marshall, Inc During June, Purchases of Direct Materials Were $1,500

Inventory balances for Marshall, Inc., in June 2018 are as follows: $$\begin{array} { l c c } & \text { June } 1,2018 & \text { June } 30,2018 \\\text { Raw materials } & \$ 1,125 & \$ 875 \\\text { Work in process } & 2,000 & 1,550 \\\text { Finished goods } & 4,500 & 3,750\end{array}$$
During June, purchases of direct materials were $1,500. Direct labor and factory overhead costs were $2,500 and $3,500, respectively.
Conversion costs for June were

A) $8,200.
B) $7,750.
C) $7,500.
D) $6,000.