The following data (in thousands of dollars) have been taken from the accounting records of Karstone Corporation for the just completed year.

ales

$880

Raw materials inventory, beginning

$20

Raw materials inventory, ending

$30

Purchases of raw materials

$150

Direct labor

$180

Manufacturing overhead

$230

Administrative expenses

$100

Selling expenses .

$130

Work in process inventory, beginning

$80

Work in process inventory, ending

$30

Finished goods inventory, beginning

$120

Finished goods inventory, ending

$100

The cost of the raw materials used in production during the year (in thousands of dollars) was:

A) $180

B) $140

C) $160

D) $170