Aster Inc. is a trading firm. It has $5,500 worth of inventory at the beginning of the year. It made purchases worth $10,700 during the year. At the end of the year, the stock was valued at $3,700. What is the value of Aster Inc.’s cost of goods sold for the year?
A. $16,200
B. $19,900
C. $12,500
D. $8,900