What Was the Amount of Direct Materials Used During November

Multiple Choice

What was the amount of direct materials used during November if $20,000 in raw materials were purchased during the month and if the inventories were as follows?
$\begin{array}{lrr}&\text { Balance }&\text { Balance }\\&\text { November 1}&\text { November 30}\\\text { Raw materials } & \$ 4,000 & \$ 3,000 \\\text { Work in process } & \$ 12,000 & \$ 15,000 \\\text { Finished oonds } & \$ 24,000 & \$ 27000\end{array}$

A) $15,000.
B) $20,000.
C) $21,000.
D) $24,000.