A firm has net cash sales of $3500, earnings after taxes (EAT) of $1000, depreciation expense of $500, cost of goods sold (COGS) of $1500, and cash taxes of $ 500. Also, inventory decreased by $100, and accounts receivable increased by $300. What is the firm’s cash flow from operations（）
A. $1200.
B. $1800.
C. $1300.
