Gregory Mining LLC shows the following information on its 2014 income statement: sales = $317,800; costs = $211,400; other expenses = $18,500; depreciation expense = $31,200; interest expense = $2,100; taxes = $18,600; dividends = $12,000. In addition, you're told that the firm issued $4,500 in new equity during 2014, and redeemed $6,500 in outstanding long-term debt. If net fixed assets increased by $7,400 during the year, what was the addition to net working capital?

A. $17,900

B. $14,600

C. $15,800

D. $16,200

E. $17,400