A Company That Uses the Periodic Inventory Method Provides the Following

A company that uses the periodic inventory method provides the following information:
$\begin{array} { l r } \text { Beginning inventory } & \$ 4,000 \\\text { Net Purchases } & \$ 85,000\end{array}$
At the end of the period,the company does an inventory count and finds $9,000 of inventory on hand.
How much is the Cost of goods sold?

A) $98,000
B) $72,000
C) $80,000
D) $90,000